You appear to be very lucky that the machine is fully working, these were the first generation of VHS machines.
They do use quite a few belts, mainly underneath the deck. You maybe lucky enough to find a belt kit, the machine was also re-badged Ferguson and several rental company's also re-badged them.
I would not attempt to change the belts while it is working OK, but worth getting a set if you can.
These were a very good machine, but bear in mind it is over 40 years old, and may not like being disturbed unnecessarily.
Mark