What was found
CORROSION FOUND ON DRAIN MAST INNER CHANNEL @ APPROX. STRG27 & FS1031.00 (C-CHECK RO 9/8/2021) CORROSION IS EXFOLIATION. REMOVED AND REPLACED DRAIN MAST CHANNEL P/N MM670-43255-001 REF CRJ 700 SRM 51-42-06-001-001-A01 AND DRAWING MM670-43200 REV N. POTABLE-WASH/WATER SYS AND AFT FILL/DRAIN VALVE OPS CHK GOOD SEE CONT CARD. OPS, LEAK, AND PRESSURE CHECKS GOOD. COMPLIED WITH TASK CARD 51-900-1002-SKY. SEE CONTINUATION CARD FOR DETAILS.