As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING ENG FIRE TEST THE #2 ENG FIRE SWITCH DOES NOT ILLUMINATE. GROUNDED - YES. PERFORMED ENGINE/APU FIRE DETECTION CONTROL MODULE BITE REFERENCE B737-800 FIM 26-10 TASK 801. TEST PASS. OPERATED ENG 2 AT IDLE FOR FIVE MINUTES REFERENCE AMM 71-00-00 AND ACCOMPLISHED ENGINE FIRE DETECTION OPERATIONAL TEST REFERENCE AMM 26-11-00-710-801. TEST PASS.