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D198 is a diode. It burns when the amp loses the chassis ground connection and the amp tries to ground through the RCA shield. If the amp is still working, it's better to leave that diode out of the circuit. That's what MTX did on later models.
Depending on whats wrong with it, bench fees to check it usually start at $45 and then they will tell you parts and labor. without knowing what burned up its hard to quote.
when you do find a replacement use Kapton tape to reduce the heat on the parts use around component and around surrounding area except the place to be soldered
you have to send it to mtx. Most repair shops wont touch it. You can call mtx i had the same amp. It cost about 85 bucks plus shipping. the 85 bucks covered return shipping also.go to there web site it has the info for tech support and repair issue there. hope this helps
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