hifi engine

Balance Problem for DEnon PMA 700V

I have a very (up to now) Reliable Denon PMA700V Amplifier, which has started developing a problem with the Balance adjustments.

From the Service Manual it is Part Number 2119021004 (Balance VR 200k Ohm)

Any idea where I can source this Part or stockists of Denon spare Parts?

Thanks in Advance