What was found
MAIN AVIONICS COMPARTMENT R/H ATC ANTENNA CHANNEL(AT FS 349-364 STGR 26R-25R) IS CORRODED. CORECTIVE ACTION: REMOVED AND REPLACED ATC ANTENNA BRACKET(PN:SH670-31062-5) IAW CRJ 900 SRM 51-21-06, 51-42-06, 51-40-11, 51-25-06, 51-21-11, 51-21-01, AND 51-25-16.