So Thomann sent me replacment volume knob and PCBs for free! See photo. Apparently covered under warranty.
 
	 
 
	I just need to pluck up the courage to lift the scratch plate and fit the new PCBs in place - hopefully not too difficult a job.
 
	 
 
	Thanks everyone (especially Thomann) who replied to my plea for help.
 
	 
 
	Cheers
 
	 
 
	Gary
 
	 
 
	I was wondering about changing the black plastic knobs for metal ones. Any advice on this and where I might get them to fit a Sire P7?