What was found
PRIOR TO B-CHECK, ENGINE RUN, MECHANIC NOTICED SMALL PIECE OF METAL MISSING FROM NR 1 ENGINE NOSE COWL ASSEMBLY MOUNT RING AT LOWER MOUNT BOLT. UPON FURTHER INSPECTION, MOUNT RING WAS FOUND CRACKED OUT AROUND 10 OF 23 MOUNT BOLTS. REMOVED NOSE COWL ASSY. INSPECTED ENGINE, NO DEFECTS NOTED. INSTALLED SERVICEABLE NOSE COWL ASSY. RAN ENGINE, OPS AND LEAK CHECKS OK. NOTIFIED AIRCRAFT OWNER/OPERATOR AND STC HOLDER FOR STAGE 3 NOSE COWL ASSY.