What was found
INSPECTION TYPE: NA ATB-EMERGENCY DECLARED, NO EQUIPMENT USED. A/C WAS TAKEN OUT OF SERVICE. ON DEPARTURE AT 1500' AGL AFTER SELECTING VNAV RT ENGINE N1 ROLLED BACK TO 27% LOUD S RUMBLE IN AIRCRAFT W/POWER LOSS IN RT ENGINE. ENGINE RAN AT IDLE LEFT UNTIL CLEAR AT RUNWAY ON APPROACH. RT ENGINE BOROSCOPED OUT OF LIMITS DAMAGE FOUND IN HPC AND HPT, IAW AMM 72-00-00-206-146-H00. R & R RT ENGINE, IAW TC 6001 & TC6002. C/W EO B767-2610-7409-B & E-7900-62890-N APPX B. OPERATIONS CHECK ENGINE TC 2001 REV 11/14/19. ENGINE OPERATIONS NORMAL. NOT LEAKS FOUND.