As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE LEVEL FLT 330 MAIN CARGO DOOR LIGHT ILLUM ON 2ND OFF PNL. FOLLOW RED TAB HOWEVER, LIGHT REMAIN ON. *S/D* REMOVED AND REPLACED LATCH WARN SWITCH 9034 PER BOEING STANDARD WIRING PRACTICES MANUAL CHPT 20. OPS CK OK PER MM 52-70-001-5.