As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFT LOWER CARGO DETECTION LOOP "A" WILL NOT TEST. VERIFIED "A" LOOP IN AFT CARGO PIT WON'T TEST. PULLED AND COLLARD C/B'S AT P18 3 C18 & C19. CLEANED "A" LOOP DETECTOR ASSY IN AFT CARGO PIT REF MM 26 16 01. RESET C/B'S AND OPS TEST NORMAL REF MM 26 16 00.