As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CORROSION ON INBOARD SLIDER AT RH ENGINE LOWER AND UPPER TRANSCOWL. DUE TO NOT ALLOWABLE DAMAGE ON INBOARD SLIDER AT RH ENGINE, LOWER TRANSCOWL (P/N: CN624-2001-011 S/N: SB1009) AND UPPER TRANSCOWL (P/N: CN624-2001-012 S/N: SB1006) WERE REPLACED BY RH SERVICIABLE LOWER TRANSCOWL (P/N:CN624-2001-013 S/N: SB1043) AND SERVICEABLE UPPER TRANSCOWL (P/N: KCN624-2003-6 S/N: SB0868) PER CRJ900 SRM 54-21-00-101-001-A01 AND CRJ900 IPC 78-33-01 AND WERE INSTALLED WITH CARD 900-78-440-120