What a nightmare. I have found that swapping and over-tinkering with the hardware can and will produce unexpected and frustrating circumstances. My A3000D and A3000T both suffered from almost fatal errors because I had tried to do too much all at once. If it doesn't crackle or smoke, then chances are it's something simple. :-D
I'll take that MKII 060 off your hands if it'll work in a 3000T. :hammer: