As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT CARGO COMPARTMENT LIGHTS DO NOT REMAIN ILLUMINATED WHEN APU POWER IS ON. WORKS OK ON EXTERIOR. COMPLIED IAW MEL. LIGHTS WORKS NORMAL WITH GROUND POWER NOT WITH APU POWER. APU ELECTRICAL INOPERATIVE. REPLACED RELAY K101, IAW AMM 24-51-01-401. GROUND BUSSES POWER NORMALLY FOR EXTERNAL & APU SOURCES. CARGO PITS POWERED WITH APU ON & EXTERIOR POWER DISCONNECTED.