Hello bungles
as Avionic says, get service manual (original if you can because high quality of schematic and text in many pages is important )
About B1
2) recaping is a good idea if it is done the way it should be . The main problem with B1 is the double electrolytic type (15000MF/15000MF/100V) . Many get shorted ( or bad ) without advice you before and then damage one of the 2SK77 FET.
3) give us (in private message if you prefer) all the PCB numbers because different models does exist and I don't want to say something wrong to you .
4) do it step by step board by board (take you time ) and do not switch on before to have replaced these both capacitors (15000MF)
About C1
This is a serious job to do and I will strongly recommend you to do it like in B1 (board by board , taking your time )
Last time I did it, I spend more than a complete day to do a C1 !
Be carefull because there is many BP ( non polarized cap ) in C1 and don't make any mix .
You will find a lot of bad soldering on the bottom of the power supply board again do it slowly .
I have 2 B1 for repair here , ready to be use , already recaped , just waiting for new type of 15000MF/15000MF/100V !
UC1 is not complicate .
do not hesitate to come back to us if you need anything , Avionic , vint age and I are reading your message with a big interest !