As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON STRINGER 24RH IN BS 280 TO 333 AT INTERNAL STRUCTURE OF MAIN AVIONICS COMPARTMENT. STRINGER 24RH IN FS= 280 TO FS= 333 WAS REMOVED AND NEW STRINGER 24RH IN FS= 280 TO FS= 333 WAS INSTALLED PER CRJ 900 SRM 51-42-06-001-001-A01.