help: Fostex R-8 multitrack broken

[jh.]

In the midst of a recording session, my Fostex R-8 has left me.

The right reel (which is filled during Play and FFWD) is not
driven by the motor anymore, and turning it manually makes
rattling noises.
When I hit the Play or FFWD button, a motor starts inside,
and there are more rattling noises, but the reel does not
move.

Does anybody have experience with this model ?
A service manual even ?
Dare I ask - is it online somewhere ?

For first aid, when I want to open it, do I remove the screws
on the front or on the rear to access the motors / mechanical
parts ?

Any helpful hints welcome !

Thanks in advance,

JH. - who faces Christmas holidays without a multitrack