As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FIRE TEST # 2 FIRE SWITCH DOES NOT ILLUMINATED AND HAS ASSOCIATED FAULT LIGHT. GROUNDED - YES. ACCOMPLISHED B737-800 FIM 26-10 TASK 801, NO FAULTS FOUND. REMOVED AND INSTALLED NEW #2 ENGINE CORE FIRE DETECTION HARNESS (MW0325), OPS NORMAL. GROUND VERIFICATION SUCCESSFUL.