As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER BLOCK OUT FOUND EMERGENCY EXIT LIGHTS REMAINED ON UNABLE TO RESTORE NORMAL FUNCTION.AC RETURNED TO THE GATE (BTB) AND MTX GROUNDED AC TROUBLESHOT AND FOUND PLUG 1084 ON SPARE BATTERY PACK DUE TO TASK ABX-33-007-00-01-M.SWAPPED CONNECTOR TO NORMAL POSITION PER WDM 33-51-13-OPS CHKD OK. RETURNED AC TO SERVICE