Not trying to sound like a dick here, but, if the machine played fine at his house..then that is where his responsibility ends....

You played it..fully functioning, and you bought it... it is what it is..

It has happend to me as well.....

its a mchine and they break.... unfortunatly it broke on you....

CP is known for boxer issues anyway... it is an inherant problem..

Just as BSD mist ball is a well known weak spot...

Somtimes you eat the bear, and somtimes the bear eats you.... thats life in pinball...

Seen it before, not that that is how i would repair it, but yep on more than one occasion...

If that is where you knew your problem lied, then you shoulda attacked that area and de-cobbled it..

went through and made sure it was repaird the right way and then trouble shot from there...

and yes i know it sucks that you have spent so much time and money with your TECH...but it may be time to find a new TECH... that can do the job right and cost effectively...

ie. knows what he is doing..

If i had a car at a repair shop, and they threw 50 parts at it trying to figure it out, but it still didnt fix it... and they charged me for it... i would find a new repair shop..

+1000 the guys isnt a TECH... he is a parts changer...

Rubbed through wires on the boxer is the #1 common problem with CP...

It is the absolute first thing you should check when you get the machine even if it is working properly when you get it or not..