What was found
L/H SIDE FWD EMER EXIT SURROUND STRUCTURE FUSELAGE LOWER THRESHOLD HAS SMALL AREAS OF CORROSION. (C CHECK RO 5/23/22) REMOVED CORROSION FOR LH SIDE EMER EXIT SURROUND STRUCTURE, LOWER THRESSHOLD PER CRJ 900 SRM 51-21-06-001-001-A01. FOUND TO BE OUT OF LIMITS.ORDERED AND RECEIVED LH FWD EMER EXIT STEP PLATE P/N SH670-36552-1 AND INSTALLED ANTISKID WALKAWAY TAPE PER CRJ 900 AMM 20-60-09-400-801-A01