What was found
MCN - MAJOR REPAIR - DURING C-04 CHECK GALVANIC CORROSION WAS FOUND ON THE LOWER SURFACE OF RT CREASE BEAM (SHEAR PLATE) FROM BS 69 TO BS 70. MAINTENANCE REMOVED DAMAGED CREASE BEAM; FABRICATED A REPLACEMENT CREASE BEAM; INSTALLED REPAIR PART IAW A320 SRM 51-11-42, PG 10 & 12, AND SRM 51-42-11 FIG 59-62, PG 20-27.