Been noticing a few folks asking for TSB numbers. I just received my Ford Service DVD I got off ebay - July 2003 edition so it ought to be close to up to date. Here are the TSB's it lists:
2003 MUSTANG - TSBs found: 16
03-11-06 ELECTRICAL - WIRING - SOLDERING AND CRIMPING REPAIRS - SERVICE TIPS
03-11-04 ENGINE - MUSTANG COBRA - TICK NOISE FROM ENGINE - COBRA VEHICLES EQUIPPED WITH ENGINES BUILT BEFORE 11/1/2002 ONLY
03-10-01 PAINT - PLASTIC BUMPER/FASCIA PARTS - PREPARATION PROCEDURES - SERVICE TIPS
03-09-08 DRIVEABILITY - MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED WITH DTC'S P0442, P0455, P0456, P0457, P1442 OR "CHECK FUEL CAP" LAMP ILLUMINATED WITH DTC P0457
03-09-05 SUSPENSION - CLUNK OR POP NOISE FROM REAR SUSPENSION - MUSTANG COBRA ONLY - SERVICE TIPS
NOISE - CLUNK OR POP NOISE FROM REAR SUSPENSION - MUSTANG COBRA ONLY - SERVICE TIPS
03-08-03 ENGINE - ENGINE OIL LEVEL INDICATOR MARKINGS - REPORTS OF LOW OIL LEVELS
03-03-06 SUSPENSION - DRIFT OR PULL TO RIGHT OR LEFT - MUSTANG COBRA MODELS ONLY
03-01-05 TRIM - PASSENGER SEAT RUBS AGAINST DOOR PANEL
02-23-07 COOLING SYSTEM - MOTORCRAFT PREMIUM GOLD ENGINE COOLANT - SERVICE TIPS
02-23-03 DRIVEABILITY - FUEL PRESSURE RELIEF VALVE (SCHRADER VALVE) DISCONTINUED
ENGINE - 3.0L/3.8L/4.6L - FUEL PRESSURE RELIEF VALVE (SCHRADER VALVE) DISCONTINUED
02-22-01 DRIVEABILITY - SURGE/ROLLING IDLE - GEAR DRIVEN SYNCHRONIZERS - INCORRECT INSTALLATION - CAMSHAFT POSITION SYNCHRONIZER (CMP) INSTALLATION TOOL CORRECT APPLICATION
ENGINE - GEAR DRIVEN SYNCHRONIZERS - INCORRECT INSTALLATION - CAMSHAFT POSITION SYNCHRONIZER (CMP) INSTALLATION TOOL CORRECT APPLICATION
02-21-13 ENGINE - STRAIGHTEDGE PROCEDURE FOR CHECKING CYLINDER HEAD AND BLOCK FLATNESS
02-20-08 CLIMATE CONTROL - A/C SERVICE TECH TIPS
02-17-08 NOISE - WINDNOISE FROM THE "A" PILLAR AREA
02-17-06 LAMP - BRAKE - INADVERTENT DISABLING OF BRAKE SHIFT INTERLOCK
02-16-07 BODY - PAINT - APPROVED PAINT MATERIALS FOR WARRANTY REPAIRS
Hope this helps.
2003 MUSTANG - TSBs found: 16
03-11-06 ELECTRICAL - WIRING - SOLDERING AND CRIMPING REPAIRS - SERVICE TIPS
03-11-04 ENGINE - MUSTANG COBRA - TICK NOISE FROM ENGINE - COBRA VEHICLES EQUIPPED WITH ENGINES BUILT BEFORE 11/1/2002 ONLY
03-10-01 PAINT - PLASTIC BUMPER/FASCIA PARTS - PREPARATION PROCEDURES - SERVICE TIPS
03-09-08 DRIVEABILITY - MALFUNCTION INDICATOR LAMP (MIL) ILLUMINATED WITH DTC'S P0442, P0455, P0456, P0457, P1442 OR "CHECK FUEL CAP" LAMP ILLUMINATED WITH DTC P0457
03-09-05 SUSPENSION - CLUNK OR POP NOISE FROM REAR SUSPENSION - MUSTANG COBRA ONLY - SERVICE TIPS
NOISE - CLUNK OR POP NOISE FROM REAR SUSPENSION - MUSTANG COBRA ONLY - SERVICE TIPS
03-08-03 ENGINE - ENGINE OIL LEVEL INDICATOR MARKINGS - REPORTS OF LOW OIL LEVELS
03-03-06 SUSPENSION - DRIFT OR PULL TO RIGHT OR LEFT - MUSTANG COBRA MODELS ONLY
03-01-05 TRIM - PASSENGER SEAT RUBS AGAINST DOOR PANEL
02-23-07 COOLING SYSTEM - MOTORCRAFT PREMIUM GOLD ENGINE COOLANT - SERVICE TIPS
02-23-03 DRIVEABILITY - FUEL PRESSURE RELIEF VALVE (SCHRADER VALVE) DISCONTINUED
ENGINE - 3.0L/3.8L/4.6L - FUEL PRESSURE RELIEF VALVE (SCHRADER VALVE) DISCONTINUED
02-22-01 DRIVEABILITY - SURGE/ROLLING IDLE - GEAR DRIVEN SYNCHRONIZERS - INCORRECT INSTALLATION - CAMSHAFT POSITION SYNCHRONIZER (CMP) INSTALLATION TOOL CORRECT APPLICATION
ENGINE - GEAR DRIVEN SYNCHRONIZERS - INCORRECT INSTALLATION - CAMSHAFT POSITION SYNCHRONIZER (CMP) INSTALLATION TOOL CORRECT APPLICATION
02-21-13 ENGINE - STRAIGHTEDGE PROCEDURE FOR CHECKING CYLINDER HEAD AND BLOCK FLATNESS
02-20-08 CLIMATE CONTROL - A/C SERVICE TECH TIPS
02-17-08 NOISE - WINDNOISE FROM THE "A" PILLAR AREA
02-17-06 LAMP - BRAKE - INADVERTENT DISABLING OF BRAKE SHIFT INTERLOCK
02-16-07 BODY - PAINT - APPROVED PAINT MATERIALS FOR WARRANTY REPAIRS
Hope this helps.