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I'm getting a bit of reverb bleed through on my Carlsbro PA60R when the reverb control is at minimum.

http://www.chambonino.com/carlsbro/carl60par.html

What would you check first?

I'd check continuity between the wiper of the reverb pot and ground when it is dialed to minimum. You should measure zero ohms there. Any non zero ohm condition will result in reverb.