As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AT DEPARTURE, EEL LIGHTS CAME ON AND WOULD NOT EXTINGUISH. *S/D* SWOPPED NEW BATTERY AND CHARGER IN BOTH FWD POSITIONS, NO HELP. NEW BATTERY AND CHARGER WORKED NORMAL IN MID POSITIONS. SWITCHED AFT BATTERY PACK FROM AFT CABIN INSTALLED FWD BATTERY PACK IN 2L OPS CKD OK. REPLACED BATTERY CHARGER AND BATTERY PACK, OPERATED TEST BUTTON AT 2L STAY ON 25 SEC AND OPS EEL IN FLIGHT DECK OPS CKD NORMAL.