What was found
EGLL - DURING OVERNIGHT MAINTENANCE, EMERGENCY LIGHT OVER 4L DOOR FLICKERS ON AND OFF. RESEATED 4L LAMP. SYSTEM GROUND CHECK NORMAL OPERATION. (M)
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
EGLL - DURING OVERNIGHT MAINTENANCE, EMERGENCY LIGHT OVER 4L DOOR FLICKERS ON AND OFF. RESEATED 4L LAMP. SYSTEM GROUND CHECK NORMAL OPERATION. (M)