As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING SCHEDULED C-1 CHECK WHILE PERFORMING OTHER MAINTENANCE, FOUND THE CENTER WING CWS56L AND CWS56R DRAIN TROUGH INTERIOR DOUBLERS (STRAPS) CORRODED; FS597, WL256. REPAIR BY REPLACEMENT ACCOMPLISHED IAW SRM, CH. 51-60 & 51-70. NR# 6164.