From my ham shack. I originally got this in a package deal with a Yaesu FT-736R and it never got that much use although it works fine. I never had a manual for this, though they're available online. This also, fairly obviously, does not include the phone patch option.
The two electrolytic capacitors pictured should maybe be swapped out just because they're electrolytics and getting long in the tooth. I didn't measure them. Note the schematic I found online specifies them as 33µF 50V NP0 which I find a little hard to believe (the NP0 part I mean).
Cheers very much
73 DE K8TIY