What was found
AVIONICS BAY DOOR FWD INTERCOSTAL TO THE LEFT STR 27 IS CORRODED AT THE FWD END. INTERCOSTAL OUT OF LIMITS, LOCATED, DRILLED, AND INSTALLED NEW FWD INTERCOSTAL PN:SH670-320-75-3 IAW CRJ 900 SRM 51-40-11-001-001-A01, 51-21-11-001-001-A01, 51-21-16-001-001-A01 AND 51-77-00-001-001-A01.