The AC fuse keeps blowing on my amp. Help

I have a Cary SLI-80 integrated tube amp that I just got back from the repair shop after someone dropped it during shipping. I used it for about 3 days w/o any fuse problems before it went in for repairs and the repairs were to a broken speaker post and the triode/ultralinear switches. They also replace a few capacitors(?) to cure a volume imbalance and a hum in the right speaker. Everything works great now but only for about an hour then the AC fuse blows. The manual suggests a possible short in the rectifiers but I have no replacements. (nor can I find any CV-729's) Also, I noticed while switching fuses that they were 2.5A 250v fuses and the manual calls for 3A 250v. Could this extra 0.5A be the problem? or should I be going back to the shop? I am reluctant on the latter as it took them 2 months!! to do the last repair job. Any ideas? I recently moved but have an ultimate outlet between the amp and the wall so I don't imagine it is the AC. Thanks for your help.