As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT ATTENDANT REPORTED, THE AFT LEFT OVERWING EXIT EMERGENCY LIGHT AND LAST FOUR PASSENGER ROW EMERGENCY LIGHTS ILLUMINATE WHEN PRESSURE IS APPLIED TO OUTER WALL OF LEFT LAVATORY AND ALSO BLINK ON AND OFF DURING FINAL APPROACH. REPLACED AFT BATTERY PACK DUE TO SHORT. OPERATIONAL CHECK NORMAL.