Kicker ZR one channel low

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Those numbers don't look familiar. The MJE4343 and MJE4353 may have been used in some of the amps.

Since one failed, you need to replace (at least) all that were in parallel with the one that failed.

The FJA4313 and FJA4213 may be good subs but you'll have to carefully check the bias through the entire thermal operating range to confirm that the bias holds with those transistors.
 
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