What was found
WHILE ACCOMPLISHING T/C 78233008 " EMERGENCY LIGHTS OPERATIONAL CHECK" LH AFT OVERWING EXIT SIGN UNABLE TO ILLUMINATE. GROUNDED - YES. REMOVED PASSENGER SERVICE UNITS AND OVERHEAD BIN/MODULES ABOVE ROW 17ABC TO GAIN ACCESS TO TERMINAL BLOCK GD3744 REF WDM 33-51-13 PG 5 SHT 1. AND EA 900ER-33EA-28404. OPS CHK ACCOMPLISHED PER AMM TASK 33-51-00-710-801. OPS CHECK GOOD. REINSTALLED OVERHEAD BIN/MODULE AND PSU'S REF AMM 25-24-31 AND 21-24-04. TERMINAL BLOCK R/R IAW WDM 33-51-13, PG 5, SHEET 1. AND EA 900ER-33EA-28404.