Should I

If this is your main system amp, then yes, I would recap for reliability and hopefully better sound. Jerry

I'd call Roland and get their thoughts. 

I'd send unit to a pro and let them check everything, would not replace anything still within oem specs.

     There are a minimum of 26 aluminum electrolytics (that I know of) in your amp's critical circuitry.

     Thirty years is stretching it, regardless of that type capacitor's original build quality, or country of origin.