As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EMERGENCY LIGHTS TURN ON WHEN SWITCH IS ON; THEN THE LIGHTS DIM AND EXTINGUISH UNCOMMANDED. (FLT 5354) REPLACED ALL 4 SUPPLY BATTERIES IAW AMM (PN AD-2013-1A/SN ON 43883 - SN OFF 75930), (PN 2013-1A/SN ON 93948 - PN OFF AD-2013-1A/SN OFF 75712), (PN ON 2013-1A/SN ON 107208 - PN OFF AD-2013-1A/SN OFF 66808), (PN ON AD-2013-1A/SN ON 70752 - PN OFF 2013-1A/SN OFF 107289).