What was found
MECHANICAL GRINDING NOISE DURING T/O & CLIMB. NO ABNORMAL ENGINE INDICATIONS NOTED. NOISE AT HIGH POWER SETTINGS ONLY.<[01] COMPRESSOR STALL BOROSCOPE REQUIRED REF AMM 72-00-00-200-804-F00. COMPLIED WITH POWER ASSURANCE RUN REF AMM 71-00-00 TEST 5. CYCLED ON AND OFF. ENGINE ACCESSORIES I.E. HYD PUMP; STBY; HYD PUMP; IDG; BLEED AIR; AIR CONDITIONING PACKS; CYCLED FLIGHT CONTROLS DURING ENGINE RUN. NO ABNORMAL CONDITIONS OBSERVED.;[02] PERFORMED COMPRESSOR STALL BOROSCOPE PER 72-00-00-200-804-F00.