As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
F/A REPORT EMERGENCY EXIT LIGHTS FLASHED 3 TIMES IN FLIGHT ALONG WITH CABIN LIGHTS FLASHING. OCCURRED AFTER REPLACEMENT OF IDG AND GCU. ACCMP ENG RUNS TO ISOLATE WHICH GEN CAUSING CABIN LIGHT FLICKERING. REPLACING NR 1 GENERATOR. RAN ENGINES AND TRANSFERRED POWER BETWEEN ENGINES AND APU. NO FLASHING OF LIGHTS NOTED.