As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING FIRE WARNING TEST, DID NOT GET LEFT ENGINE FIRE LOOP-B WARNING MESSAGE AND LEFT FIRE PUSH SWITCH DOES NOT ILLUMINATE. INSPECTED LT ENGINE FIRE LOOPS, NO PROBLEMS NOTED. FOUND LT FIRE PUSH SWITCH LIGHT LOOSE IN ITS SOCKET. RESECURED THE FIRE PUSH SWITCH LIGHT IAW ESPM 20-24-00 ENGINE FIRE LOOPS OPS CHECK IAW AMM 26-11-00 GOOD AT THIS TIME.