As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 2007. TRANSITORY EICAS MESSAGE ON POWER-UP "EMER LIGHT BATT FAULT" REMOVED FROM SERVICE. PERFORMED OPS TEST OF THE EMERGENCY LIGHTING SYSTEM. OPS CHECK GOOD. REF. AMM 33-50-00-710-801-A. COULD NOT DUPLICATE. RETURNED TO SERVICE. NO PARTS REPLACED.