What was found
***WHILE A/C WAS OUT OF SERVICE FOR A HEAVY CHECK*** FWD FUSELAGE EXTERNAL SKIN FR1-2, STGR20-22L, 4 PROTRUDING DENTS AT RVSM AREA. 4 EA DENTS IN LH RVSM AREA WERE FOUND TO BE WITHIN LIMITS IAW ETD2019-170-157004. A/C REMAINS OUT OF SERVICE FOR HEAVY CHECK COMPLETION.