What was found
SEA FLIGHT NR 2400: POWERPLANT MESSAGE OCCURRED AFTER PUSHBACK AND AFTER CONDITION LEVERS PUSHED FORWARD. MAINTENANCE FOUND FAULT CODE 130 ON NR 2 ENGINE CHAN B. CLEARED FAULT CODE. CLEANED ALL PEC AND PCU CONNECTOR PLUGS ON NR 2 ENGINE. GROUND RAN NR 2 ENGINE THROUGH VARIOUS PLA AND CLA'S. OPERATED NR 2 ENGINE THROUGH 2 SEPARATE GROUND RUNS AND ENGINE STARTS. HAD NOTED PCU CONNECTOR PLUG P28 AND P29 WERE LOOSE. C/W FIM TASK 61-20-03-810-815. FAULT CODE DOES NOT REAPPEAR. OPS CHECK GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.