As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON PREFLIGHT CHECK, FOUND EMERGENCY LIGHT DOES NOT ILLUMINATE DURING EMERGENCY LIGHT TEST AND ALSO WHEN S/W SELECTED ON. IDENTIFIED PARTS EMERG EXIT LIGHTS MPN: 60-4411-5 CPN: 3300197. WHILE TROUBLESHOOTING EMER LIGHTS RAN R-T-S ON MSC, ONCE TEST PASSED OPS CHECKED EMER LIGHTS SYSTEM IAW 33-50-00-5. OPS CHECK GOOD, SUSPECT MSC HAD CAUSE RELAY R2-5700 TO HANG UP.