What was found
MAIN AVIONICS BAY FWD DRAIN MAST DOUBLER FROM FS333.00 TO FS349.00 BETWEEN STR 25R AND STR 24R CORRODED (C-CHECK RO 9/8/2021) FOUND CORROSION TO BE OUT OF LIMITS ON MAIN AVIONICS BAY FWD DRAIN MAST DOUBLER FROM FS333.00 TO FS349.00 BETWEEN STGR 25R AND STGR 24R REF. CRJ-900 SRM, 53-21-01-101-006-A04. REMOVED AND REPLACED FWD DRAIN MAST DOUBLER FROM FS333.00 TO FS349.00 BETWEEN STGR 25R AND STGR 24R REF. CRJ-900 SRM, 51-42-06-001-001-A01 AND DWG SH670-32250 REV NC. COMPLIED WITH SKY CARD 51-900-1002-SKY.PRESSURE LEAK CHECK GOOD.