Right. From what I've heard, the adjustment will only fix the problem temporarily. What's needed now is to replace all the capicators on (or "recap") the analogue board. If that doesn't help, then do the PSU, and then if that doesn't help then do the logic board. Adjusting the voltage will only fix the problem temporarily, as the capicitors will continue to get worse-therefore making the problem reuturn.
BTW If you're not comfortable doing the job yourself, then send it over to uniserver.