What was found
BATTERY RIBS ON LT SIDE AT WING STATION 48.30 & 53.60, HAVE CORROSION. CONTINUATION CARD 8788615 OP 50, 51, 53 & 70. R & R LT WING LOWER SKIN PANEL, PN 601R10213-3, IAW SRM 51-42-21. REPAIRED IAW EA CRJ257-04062. R & R BATTERY RIB, PN 601R10203-27, AT WS 53.60 IAW SRM 51-42-21 & EA CRJ257-04034 REV C DATED 02 22 2016. REPAIRED LT WING LOWER WING PLANK TE IAW EA CRJ257-04034 REV C DATED 02 22 2016. REF ATTACHED COPY FOR WORK PERFORMED. THIS IS A MAJOR REPAIR.