What was found
INSIDE MAINTENANCE DOOR 172BR FOUND INTERCOSTAL JUST AFT F.S. 574, BETWEEN STGR 22R-24R CORRODED (C-CHECK RO 9/28/2022) UPON FURTHER EVALUATION, FOUND THE PART IN QUESTION TO BE AN ANGLE ATTACHING TO THE AFT SIDE OF F.S.574.00. NOT AN INTERCOSTAL. ANGLE IS CORRODED OUT OF LIMITS IAW CRJ-200 SRM 53-00-00 DUE TO CORROSION ACROSS MULTIPLE ELEMENTS AND AREA OF CORROSION. LOCATED AND DRILLED NEW UPPER ANGLE PN# 601R35226-31 PO# W88262 AND LOWER ANGLE PN# 601R35226-35 PO# W88262 IAW CRJ 200 SRM 51-40-11. INSTALLED NEW UPPER AND LOWER ANGLE IAW CRJ 200 SRM 51-42-06. FORM 337 AND MAJOR REPAIR TASK CARD 51-900-1003-SKY COMPLETED AND ATTACHED. NO WEIGHT CHANGE. SEE CONTINUATION CARD FOR DETAILS OF WORK PERFORMED.