Damaged connection PCB between Sega CD and Genesis

I have a Sega CD with a damaged connection board between Sega CD and Genesis. I know because I exchanged it with another and it worked perfectly. The thing is that everything looks good and there is continuity in all the pins, so I am thinking that it could be the electronic components of it. I have the values of almost all the components on the board but the maintenance manual does not have the value of the capacitor C21, does anyone have any idea what value this is? It would also help me to know what size capacitors should be since the manual does not specify this either.