Fuses keep blowing

I have a Jolida 502a integrated amp, and it's worked perfectly fine for the last couple of years that I've owned it. Today, I turned it on, to let it warm up before playing some CDs and when I checked on it, "no power", checked the fuse and it was blown. Put another 6.3 Fast Blo fuse in, and powered the amp up again, Couple of minutes later that fuse had blown. So, I put another fuse in and guess what, that fuse blew. So I'm think something must be wrong with the amp, but I can't figure out what it might be. So, I'm asking you guys what y'all might thing it might be. Btw, I had a "tune up" on the amp about year ago and had some resistors and caps replaced, as the amp was approaching the ten year mark. Worse comes to worse, I might have to take a drive up to Annapolis and let the Jolida techs look at it.