What was found
CREW REPORTED DENT LOCATED ON UPPER LH WINGSKIN DURING WALKAROUND. WORKING WITH MHI, DENT WAS FOUND TO BE A PREVIOUS BLEND REPAIR WITH UNDERLYING FREEZE PLUG IN THE FWD AND MID WING PLANKS. MHI OR AWA COULD NOT FIND ANY DOCUMENTATION FOR THIS REPAIR. MHI ISSUED REO 601R-57-21-3823 TO PERFORM A NEW REPAIR TO THE FWD AT MID WING PLANKS BETWEEN WS199-WS220 AT STR16. AIRCRAFT REMOVED FROM SERVICE C/W REPAIR TO LH UPPER FWD AND CTR WING PLANKS BETWEEN 119.00-220.00 AT STRG 16 PER REO 601R-57-21-3823.