As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 ENG FIRE LOOP B SYSTEM NOT WORKING (FAILED TEST). GROUNDED - YES. CLEANED BONDING SURFACES OF #1 ENG FAN DETECTORS REF B737-900 AMM 26-11-01 MOVED OVHT DET SWITCH TO NORMAL AND PERFORMED ENG FIRE OP TEST REF AMM 26-11-00-710-801 ALL INDICATIONS IN FLT DECK NORMAL AND FIRE DET CONTROL MODULE TEST SHOWS ALL LIGHTS ILLUMINATED (NO FAULTS).