As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT CRUISE, CARGO FIRE WARNING SYSTEM APPEARED TO GO INTO "TEST" MODE WITH NO AURAL. FOUND WARNING LIGHT DIM & TEST RELAY B5-81 CONTAMINATED WITH RAIN WATER. REMOVED & REPLACED B5-81 DIM & TEST RELAY PER AMM 83 -17-00. CARGO FIRE WARNING SYSTEM NOW TESTS NORMALLY- A/C OK FOR SERVICE. (LP# 5665050)