FLC OPERATED ACFT WITH INTERMITTENT CARGO DOOR OPEN LIGHT.

Narrative

ACFT (737-300) HAD RECEIVED NUMEROUS WRITE-UPS IN PREVIOUS 5 DAYS ABOUT AFT CARGO WARNING LIGHT COMING ON BRIEFLY ON TKOFS THAN GOING OUT. COMPANY MEL'ED DOOR WARNING LIGHT AS BEING INOP. (ERRONEOUS WARNING) -- AT NO TIME DOES REVIEW OF LOGBOOK MAINT SHEETS INDICATE AN INSPECTION OF LOCK AND LATCH MECHANISM WAS ACCOMPLISHED TO ASCERTAIN CORRECT TOLERANCES. MAINT ACTIONS CONSISTED OF CLEANING AND CHKING TOLERANCES OF WARNING LIGHT SWITCH. ON PUSHBACK GND HANDLERS VERIFIED AFT CARGO DOOR CROSSED AND LOCKED. ON TKOF; LIGHT CAME ON MOMENTARILY AND WENT OUT -- WE DISREGARDED AND CONTINUED TKOF WITH PRESSURIZATION NORMAL. AFTER 4 HR PLUS 10 MIN FLT AND LNDG DOOR WARNING LIGHT CAME BACK ON AND REMAINED ON. AT GATE GND CREW ADVISED AFT CARGO DOOR OPEN APPROX 6 INCHES. FO VERIFIED DOOR WOULD SWING FULLY OPEN (INWARD) AND LOCKING HANDLE COULD NOT BE MOVED TO LATCH DOOR. (PRESSURIZATION WAS KEEPING INWARD OPENING DOOR CLOSED IN FLT.) MAINT PERSONNEL SEEM TO BE GEARED TO ASSUME WARNING LIGHTS ARE FALSE -- AND GND PERSONNEL ARE NOT TRAINED WELL AT THIS COMPANY. IN THE FUTURE WHEN OPERATING WITH DOOR WARNING LIGHTS MEL'ED I WILL REQUIRE DOOR INSPECTION BY QUALIFIED MAINT PERSONNEL BEFORE GATE DEP.