What was found
(CAN) ELECTRICAL ARC BURN MARKS FOUND ON THE REAR FACE OF NUTPLATES (QTY 17) FOR THE WING FUEL TANK ACCESS DOORS. AS PER THE TECHNICAL RECORDS THERE WERE TWO REPORTED LIGHTNING STRIKES ON THIS AIRCRAFT SINCE NOVEMBER 09/2005. THE BURN MARKS ARE A LIKELY INDICATION OF LIGHTNING STRIKE ENERGY PATH. SOME OF THE ACCESS CUT-OUT ON THE UNDERWING WERE FOUND PAINTED OVER. THESE PAINT WERE REMOVED, AREA RETREATED AND NEW PANELS WERE INSTALLED. (TC# 20061101002)