As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENG #2 B FIRE LOOP DOSE NOT TEST. GROUNDED - YES. B737-9 AMM TASK 26-11-00-710-801 OP TEST FAILS. FROM FLIGHT DECK ENG 2 LOOP A&B WILL NOT TEST. NO FIRE HANDLE ILLUMINATION. AT DETECTION MODULE M 00279 IN E&E ENG 2 LOOP B FAIL AND LOOP B SHORT LIGHT ON. ORDERED DET MODULE AND TESTER AOG. FOUND COWL PIN LANYARD ACROSS FIRE LOOP TERMINALS. REPOSITIONED LANYARD. OPS CHECK GOOD REF AMM 26-11-00.