As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU INLET DOOR FRAME SUPPORT P/N 601R35210-17 CRACKED .2" LONG AT FWD BOTTOM CORNER RADIUS BETWEEN FS 654.5 - FS 672.20 STR 4L IN AFT EQUIP BAY CEILING. REPLACED APU INLET DOOR FRAME SUPPORT IAW CRJ SRM 51-42-06 FOR SOLID RIVETS, CRJ 200 SRM 51-42-13 FOR CHERRYMAX RIVETS, AND CRJ SRM 51-40-11 FOR FASTENER HOLE PREPARATION.