How to fix my preamp dilemma


My NAD integrated succumbed to old age and I found a Parasound Zamp3/Zpre2 combo on Ebay and pulled the trigger. Even this expenditure was somewhat controversial in my marital landscape, some people just don't understand audio fidelity doesn't grow on trees! For <$400, I couldn't have been happier, everything was great......but 8 months in the preamp started switching between channels and has a loud humming noise that seems like it's coming from the transformer, it powers on but is unresponsive.

From here I could use some advice from the knowledgeable, I'm not sure fixing the Zpre2 is money well spent, my first inclination was to find a used Zpre3, but there aren't any around. What seems more attainable at a reasonable price is a used Schiit Saga+, or an oldler Adcom, is it a bad idea to jump ship to another manufacturer given that the Zamp/Zpre are likely designed to function together?
sturdy
Bad capacitor (s),  if you open it you may see one that may be bulging or leaking. This would be the obvious sign. I think it might worth repairing. Just my opinion if you like the pre. 
Spotify downloads, via what device? A DAC. I am asking because you might get by using a passive preamp.
@mesch, I usually run Spotify through the Apple TV which is connected to television. I don’t own a dac, but I think the Zpre2 had one? I guess I’m coming from an integrated amp/cd universe and I still have a learning curve with digital sources
How did you connect the apple tv to the preamp? Or did you go thru the tv?