Test and repair amp

I’ve got an NYAL Moscode 600 and I’m in Dallas Tx. It’s 30 years plus old. Great condition, however, I’d like to get it looked at and caps replaced etc if necessary. Anyone know of a reputable service qualified to work on high end amps in Dallas. Thanks in advance, I’ve been a reader for years. This is the first time I’ve posted. Hope I’m in the right place.  Thanks, Mike G