Pianos are a collection of hundreds of moving parts. Keeping these moving parts working is the function of regulation. When parts stick, jam or break, repair work is needed. Repair work involves replacement or repair of existing parts, keeping the piano in original condition.
Most repair work can be done in the home, however major replacement work such as re- pinning and restringing, falls under the restoration category, and should be performed in a fully equipped piano repair shop.
Repair work includes repairing broken action parts such as hammer shanks, butts, wippens, damper levers and flanges. Keytops are frequently chipped or removed, requiring repair. Case parts, such as moving panels and keyboard covers, can jam or become damaged requiring repair and finish touch up. Loose tuning pins can be replaced with oversize pins, providing that the pinblock is is good shape.