As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SLAT TRACKS 1-1 (P/N: CC670-12010-5} AND 1-2 (P/N: CC670-12021-9) AND 1-3 (P/N: CC670-12030-3} ON THE LH WING WERE_ FOUND TO HAVE CORROSION DAMAGE ON THE UPPER AND /OR LOWER SURFACES. PERFORMED PERM REPAIR IAW CRJ900 ILLUSTRATED PARTS CATALOG (IPC) 27-81-41, FIGURE 1, ITEM 40A, 80, AND 100A (REV. 70 DATED 10 AUG 2021).