What was found
PHL - EEL - DURING 8-DAY CHECK FOUND BOTH THE LT AND RT OVERWING EMERGENCY POWER SUPPLY UNITS INOPERATIVE. MAINTENANCE REMOVED AND REPLACED BOTH LT AND RT OVERWING EMERGENCY POWER SUPPLY UNITS, OPERATIONAL TEST WAS GOOD. PART NAME; EPSU, MFG; DIEHL GMBH, P/N; 3214-54-10, S/N; 2958, TT; 13214, TC; 5249, TSR; 8.