What was found
INSPECTION TYPE:SDR AIR TURN BACK - LOWER AFT CARGO DOOR SHOWS CARGO DOOR AFT "A" ALERT ON EAD. DEFERRED LOWER CARGO DOOR EAD DOOR OPEN ALERTING SYSTEM - LOWER AFT CARGO DOOR "A" INDICATION PER MEL 52-40-1-5. C/W DMP 52-40-1-5. **SUPPLEMENTAL SDR** FOUND SWITCH S1-383 CONNECTOR UNSECURED. CLEANED PLUG. REINSTALLED W/REF TO SWPM 20-10-01. SYSTEM OPS CHECKS GOOD W/REF TO AMM 52-33-00. THIS CLEARS M669495. PLACARD REMOVED.