What was found
EXHAUST DAMAGE - DURING WALK AROUND INSPECTION A LARGE SECTION OF HONEYCOMB FOUND MISSING AT RT ENGINE LT COWLING HEAT DAMAGE TO NR 2 ENGINE C-DUCT WAS DUE TO DEFECTIVE HIGH PRESSURE SOLENOID BLEED VALVE. MAINTENANCE REMOVED AND REPLACED NR 2 ENGINE LT HIGH PRESSURE BLEED VALVE ON BOTH THE LT AND RT BLEED SOLENOIDS. NR 2 ENGINE INBOARD C-DUCT WAS REPLACED. IP & HP COMPRESSOR AIRFLOW CONTROL TEST CHECKED GOOD. VENDOR BENCH TEST OF BLEED SOLENOID RELIEF HP3 VALVE FAILED FUCNTIONAL TEST AND INLET / EXHAUST VALVE LEAKAGE TEST AT 15 LBS. UNIT WAS DISASSEMBLED AND FOUND TO BE CONTAMINATED WITH A CARBON MATERIAL. TRIPLE SEALS ALSO CONTAMINATED WITH AN ABRADABLE MATERIAL, AND THE RELIEF VALVE SEALING SURFACE WAS DAMAGE