What was found
NR 1 ENGINE COMBUSTION CHAMBER DAMAGE BEYOND LIMITS. FOUND COMBUSTION CHAMBER CLAMP PROTRUDING INTO THE GASPATH. ENGINE REPLACED PRIOR TO FURTHER FLIGHT. TEARDOWN REVEALED THAT THE COMBUSTION CHAMBER CLAMP (C/C CLAMP) HAD BROKEN AT THE 3 O'CLOCK POSITION. ROOT CAUSE WAS THAT THE INNER BURNER LINER HAD NOT BEEN INSTALLED PROPERLY. CONSEQUENTLY, A 12-INCH SECTION OF THE CLAMP WAS NOT FULLY SEATED IN THE OUTER BURNER LINER. THIS RESULTED IN COOLING AIR LEAKING FROM THE O.D. OF THE COMBUSTOR. THIS CAUSED EXCESSIVE CLAMP RUB AND SUBSEQUENT BREAKAGE.