What was found
CABIN EMERG LIGHT: CABIN EMERGENCY LIGHTS FLASH WHILE IN FLIGHT. TURNING SWITCH TO OFF TURNS THEM OFF BUT WHENEVET THE SWITCH IS IN THE ARM POSITION THEY FLASH. REMOVED FAULTY #1 EMERGENCY BATTERY & INSTALLED MODIFIED EMERGENCY BATTERY IAW MM 33-52-01. PERFORMED THE OPERATIONAL TEST OF THE EMERGENCY BATTERY IAW PHENOM MM 33-52-01, ALLOWING THE EMER BATTS TO CHARGE FOR 30 MINUTES, THEN REMAIN ON FOR 90 MINUTES, THEN CHARGE FOR AN ADDITIONAL 90 MINUTES, WITH NO DEFECTS NOTED.