What was found
NR 1 ENGING REAR FLANGE ASSY HAS TWO CRACKS COMING FROM FASTNERS AT 1 O'CLOCK & 3 O'CLOCK. ACFT GROUNDED. REMOVED PRIMARY NOZZLE ASSY, PRIMARY PLUG ASSY R & R REAR FLANGE ASSY AND FLAME ARRESTOR GASKET. REINSTALLED PRIMARY NOZZLE ASSY AND PRIMARY PLUG ASSY ON NR 1 ENG REF MM 781-11-01-000-802-F00, 78-11-02-000-803-F00 AND 72-56-00-00-802-F00. PERFORMED TEST 3A IDLE POWER LEAK CHECK IAW AMM TASK 71-00-00-700-801-F00. NO LEAKS NOTED.