What was found
MCN - MAJOR REPAIR - "C" - DURING C-15 CHECK MAINTENANCE FOUND FUSELAGE SKIN CHAFED BELOW R/H HORIZONTAL STABILIZER APPROXIMATELY 50" AFT OF STABILIZER LEADING EDGE BS 1133. MAINTENANCE BLENDED CHAFED AREA OF SKIN AND PERFORMED MATERIAL THICKNESS MEASUREMENT FINDING MATERIAL LOSS OUT OF LIMITS PER B737-300 SRM 53-00-01, PG 101-109. REMOVED 14 RIVITS AND CUTOUT DAMAGED AREA OF SKIN, FABRICATED FILLER AND DOUBLER AND INSTALLED REPAIR IAW B737-300 SRM 51-40-02, PG 201-203.