What was found
MAST ASSY HAS PITTING, CORROSION INSIDE OF MAST POST, FROM 1 1/2 - 3 INCHES FROM TOP OF MAST, LOWER CONE WEAR SLEEVE SOUNDS DEBONDED, EXCESS WEAR, MAST NUT HAS DAMAGED THREADS. OVERHAULED MAST ASSY IAW 412 CR&O. INSTALLED NEW MAST POLE, NEW BEARINGS, NEW LOCK BEARING, NEW NUT, NEW SEAL, ASSEMBLED IAW 412 CR&O, TB 412-96-137, TB412-98-150. COMPLIED WITH TB412-96-134.TB412-98-150.