What was found
REMOVE AND REPLACE LH WING #4 SLAT TRACK DUE TO DAMAGE ON UPPER AFT AND FORWARD SURFACES. ALSO SHOWS SIGNS OF CORROSION ON INBOARD AND OUTBOARD SIDE OF TRACK WITH PREVIOUS REWORK. REMOVED AND REPLACED LH WING #4 SLAT TRACK, REF A220 AMP 57-42- 37. REFERENCE N/R 0003 ON EMPOWER W/O P070886620230728 FOR RII STEPS AND FULL INSTALL DOCUMENTATION. ALSO SEE LOG PAGE 2924587 TRACK, ASSY, SL OFF 81-5742-9-0012 00593 ON 81-5742-9-0029 04351. (LP# 2969540)