What was found
EMERGENCY LIGHTS TEST SHOWS EPSU COMM FWD L AND EPSU COMM EMER R, L. COMMUNICATION FAULT OCCURED BETWEEN EPSU'S (FWD L - 10WL, EMER R - 12WL AND EMER L - 11WL) AND CIDS. ALL THESE EPSU'S AND THEIR BATTERIES WERE REPLACED, AND SUBSEQUENT EMERGENCY LIGHT TEST WAS FOUND NORMAL. EPSU S/N REPLACED ARE AS FOLLOWS:2434, 6019, AND 6315.