What was found
EXTERNAL FUSELAGE SKIN HAS A PREVIOUS BLEND AT BS 500C+7.7", 1.5" BELOW STRINGER 4 L/H; ON EDGE OF THE UPPER SKIN AT LAP JOINT. / PREVIOUS BLEND AT B.S 500C+7.7", 1.5" BELOW STR 4L WAS REPAIRED IAW ATS ER #20-01537 REV IR AND EA 1-753-36540, REV IR.