Indigo1 keyboard troubles

[Krotoff]

Hello there!
Sorry to make my first post to this forum a depressing one, but I am having serious problems with my Indigo1 and I was wondering if perhaps someone else on here might have something to say about it...
I got a second hand Indigo about a year ago, tested it, but had no time to really play around with it. Now that I got the time I realize that it has serious problems. Occasionally, while I was playing the keyboard/tweaking the sound would cut abruptly and all the controls would freeze, with the lights still blinking but no keys or knobs would react at all. A few times when it happened the normal synth sound would be replaced with loud static buzz. "Panic" wouldn't work, the unit would have to be turned off and on in order to get back to normal.
So, I yesterday I updated to the latest OS. Now I have what seems to be a keyboard issue--random keys on the keyboard do not respond to the touch, unless you press them repeatedly, random keys "stick" (the notes hold after you release them, even though the keymode is not set to "hold"). I reinstalled an older version of OS, but the problem did not go away. I tried controlling the synth with another MIDI synth and it seems to be working ok, so looks like it's specifically the keyboard problem. Though there might be some other problems because the whole thing used to freeze on me.
Unfortunately I have no way to contact the person who sold me the synth. It's obviously not under warranty. I am new to Virus and I've never had to take a synth apart or even open one.
What would you recommend?
If you were to give a very approximate estimate how much would it might cost? As in, like, hundreds of dollars? (sorry, but again, I've never taken a synth for repair, and I happen to be extremely strapped for cash at the moment, so perhaps I should just learn to think of my Indigo as an extra bulky B??)
I would greatly appreciate any kind of help!