As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON STRINGER SPLICE 25RH IN FS= 327 TO FS= 337 AT INTERNAL STRUCTURE OF MAIN AVIONICS COMPARTMENT. STRINGER SPLICE WAS REMOVED AND NEW STRINGER SPLICE 25RH IN FS= 327 TO FS= 337 WAS INSTALLED PER CRJ900 SRM 51-42-06-001-001-A01 PAR 6C AND SRM 51-42-20-001-001-A01 PAR 6C.