What was found
DURING BOS-TOL - FLT 715 - DURING DESCENT AT FL280, THE FLIGHT CREW NOTICED THAT THE NR 1 ENGINE WOULD ONLY PRODUCE PARTIAL POWER. THE FLIGHT CREW PERFORMED A PRECAUTIONARY ENGINE SHUTDOWN ON THE NR 1 ENGINE AND DECLARED AN EMERGENCY. THE AIRCRAFT CONTINUED TO TOL AND LANDED WITHOUT FURTHER PROBLEMS. FOUND THE P/D VALVE PRESSURE LINE PACKING BLOWN OUT. REPLACED THE SAME AND MAIN OIL STRAINER IAW JT8DMM. NR 1 ENGINE OPERATIONAL AND LEAK CHECKS GOOD. THE AIRCRAFT WAS RETURNED TO SERVICE. (M)