Revox A700 losing the R channel

My Revox A700 has the following error: Losing the right channel completely if the switch is in Stereo, if the switch is in to R there is absolutely no signal, if the switch is in to L or Mono, 2 speakers and headphones have sound but the VU meter on the right does not work, when the switch is in in L the sound is louder than in Mono! When put in INPUT, turn on the source connected to INPUST's AUX 1, channel R doesn't audio and channel R's VU meter still doesn't work! So where is my Revox A700 faulty?

Thanks for the help!

 
Well, your description only tells me that your right channel is faulty. That can be anywhere in the device. You should be able to find the faulty part or circuit by limiting the possibilities. (BTW: stupid question: did you clean the selector switch with some contact cleaning like deoxit?)
Unfortunately the A700 is quite complex, so if your cabability of electronics is somehow limited you should better contact a dealer or certified workshop.
But you can also easily find a service manual for the A700 in the internet.

Here is the signal flow diagram:
 

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