What was found
* THE CENTER WING LOWER PLANK IS CHAFED AT 2 LOCATIONS ALONG ITS AFT END, JUST INBOARD OF LBL 45 AND JUST INBOARD OF RBL 45, BOTH LOCATIONS ARE BELOW THE AFT SPAR. (C-CHECK RO 5/16/2021) REPAIRED THE CENTER WING LOWER PLANK CHAFE AT 2 LOCATIONS ALONG ITS AFT END, JUST INBOARD OF LBL 45 AND JUST INBOARD OF RBL 45, BOTH LOCATIONS ARE BELOW THE AFT SPAR. REF REO 601R-57-21-3459 REV -- DATED 2021-04-13 COMPLIED WITH 28-900-1000-SKY AND 51-900-1003-SKY .LEAK CHECKS GOOD AND SEE CONTINUATION CARD FOR DETAILS