hifi engine

Kenwood KRF-V5050D

Hi everyone,
I have a Kenwood KRF-V5050D Amp + Tuner + AV switch. It;'s a very nice unit I picked up a few years back at a garage sale. It had some problems that I fixed (Volume control and remote problems) and it has been going great.

However, I don't have a service manual for it.
Can anyone help me with this please ?

Thanks in anticipation,