As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AFTER REMOVAL OF FWD LAVATORY, CHAFFING DAMAGE ON INTERCOSTAL SECTION BTW FS 364.00 TO FS 379.00 AT STGR 4 RH. INTERCOSTAL SECTION BTW FS 364.00 TO FS 379.00 AT STGR 4 RH WAS EVALUATED OUT OF LIMITS PER CRJ900 SRM 53-00-00-101-001-A01 AND REPLACED PER EA 23-C9-53-0638 REV.IR