Did my preamp short kill my Mark Levinson amps and Infinity Beta servo ?

My solid state preamp ( prefer not to name as maybe I am completely wrong in my thinking) that without warning developed a short in the right channel output due to some type of "leak" killl my wonderful vintage system?  Both ML No23 amps and the Infinity Beta bass crossover servo unit all stopped working - non of which had any external fuses blow.

I am able to get my  high end preamp fixed by the maker, but living in rual Minnesota makes it basically impossible to find a place that can look at all my other now non-functioning equipment.   (No lightening strikes and everything on high quality heavy duty line conditioners that did not trip).  The Infinity Beta servo is the unit I really hope to save because those speakers are mint and my wife actually accepts them.  Anyone know who might service that piece?