As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. SEVERAL TIMES DURING FLIGHT THE CEILING EXIT SIGN, FIRST CLASS FORWARD CEILING LIGHT 2L SIDEWALL EXIT SIGN AND FIRST CLASS ESCAPE PATH FLOOR LIGHTS COME ON BRIEFLY AND THEN GO OUT. REMOVED AND REPLACED 10WL (AALA202009239003) AND 11WL (AALA202009239024), AS PER AMM 33-51-38-00. ACCOMPLISHED EMERGENCY POWER SUPPLY UNIT SYSTEM TEST AND CABIN INTERCOMMUNICATIONS DATA SYSTEM BITE TEST. OPERATES OK, NO FAULTS. ALSO ACCOMPLISHED EMERGENCY LIGHTS OPERATIONAL TEST, PER AMM 33-51-00. OPS OK.