As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING EMERGENCY LIGHT TEST ALL LIGHTS ILLUMINATE MOMENTARILY THEN ALL LIGHTS AFT OF ROW 7 DIM AND GO OUT. REPLACED NR1, NR2, NR3 AND NR4 BATTERY PACKS. OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE. BATTERY PN 2013BR SN OFF NR1-B2425/ NR2-B2430 / NR3-B2433 / NR4-B2434. (SW21200501809) (K)