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
@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?
Ok. You are running apple tv into tv via HDMI then from tv to preamp via a pair of analog RCAs. You are using the DAC within the tv. Correct?

Your tv should have digital output. Likely optical. Yes? 
Another question, how many inputs were you using on the preamp?
For the kind of system mentioned above, the Parasound is a waste. I voted for repairing the Parasound, but in my opinion you could use anything...