Add effects Loop to old 2204

[JCH]

Hello

I want to add an effects loop to my old JCM800 2204 but I dont' know how I can do it. I've searching on the web a lot but there's not reliable sources and no build reports. Could someone please help me in this one?

A friend of mine want to add an effects loop too but is in his Plexi 1987. Anyone know this?

Thanks in advance.