What was found
CORROSION ON INTERCOSTAL ATTACHED TO STRINGER 20RH IN STA. FS= 310.00 TO FS= 364.00 AT MAIN AVIONICS COMPARTMENT, CORROSION ON INTERCOSTAL BTW FS310 TO 319 WAS REMOVED PER CRJ-900 SRM 51-21-06-001-001-A01 AND WAS EVALUATED WITHIN LIMITS PER CRJ-900 SRM 53-21-23-101-002-A02; INTERCOSTAL BTW FS319 TO FS349 WAS EVALUATED OUT OF LIMITS PER CRJ-900 SRM 53-21-23-101-002-A02 AND WAS REPLACED PER CRJ-900 SRM 51-42-21-001-001-A01 AND INTERCOSTAL BTW FS349 TO FS364 WAS CLEANED PER CRJ-900 SRM 51-26-00-001-001-A01 AND NOT DAMAGE WAS FOUND