Thanks Nutloose and those who have sent PM's. The aircraft is a Cessna.
One of the issues is that the Cessna Maintenance Manual does not allow for overhaul, only replaced, but allows the belts to be rebuilt in accordance with FAR 42.3.
Still wondering what the difference is between overhauled and rebuilt as you can replace them with rebuilt items
Originally Posted by Cessna Manual
NOTE: The terms overhaul and replacement as used within this section are defined as
follows:
Overhaul - Item may be overhauled as defined in FAR 43.2 or it can be replaced.
Replacement - Item must be replaced with a new item or a serviceable item that is
within its service life and time limits or has been rebuilt as defined in FAR 43.2.