What was found
APU WON'T START. PERFORMED APU AIR INTAKE SYSTEM TEST IAW AMM 49-15-00. AIR INTAKE CB POPS OUT. NOTICED WHEN THE INTAKE OPENS WITHOUT POPPING BREAKERS THE LT FWD FUEL PUMP LIGHT ILLUMINATED AND EXTINGUISHED CORRECTLY WITH EICAS MSGS. PER WDM 49-15-11 PAGE 1 OPERATIONS BEYOND RELAY TO APU INLET ACTUATOR IS INTERMITTENT. SUSPECT RELAY BAD. PERFORMED T/S, REMOVED AND REPLACED INLET DOOR ACTUATOR CIRCUIT BREAKER IAW SWPM 20-30-00 AND NO FIX. FOUND TRU FAN NOT RUNNING AND SUSPECT THAT IT IS THE PROBLEM. SWAPPED RELAY K176 W/ K616 FOR T/S. INLET DOOR OPS CORRECTLY W/ LT FWD FUEL LOW PRESSURE LIGHT. RETURNED RELAYS TO ORIGINAL POSITION. REMOVED AND REPLACED RELAY K176 IAW WDM 49-15-11. OPS CHECK APU IAW AMM 49-11-00; OPS CHECKED NORMAL AT THIS TIME.