the amp working normaly to double 18 sub.till start to go radomly on protect.but no stable may stay for hour on or few minutes.i check and resolder all main joints.on thermal camera shows the R159 47K gets hot to 120c.another thing is i can't set the bias the pot on the hot side.trim don't respont.trim checked and is ok.replace the R159 R160 and Q114 optional.the old resistors measure on specs.have checked all resistors around idle cirquit found nothing broken any ideas what more to look at?thanks for any help.
