hifi engine

Akai X-100D Service Manual required

Hi folks. I'm trying to restore an Akai X-100D. It has a problem with the playback/record board where there is a constant, mains frequency feedback on just the right channel. I need to trace the fault and could really do with the service manual for this great Akai.
On the site there is the owners manual but if someone out there has a copy of the service manual I'd be so grateful.