Thought I`d drop this in as it came as a surprise.
Daft idea to try using the bi-wiring option on my ML`s by just connecting different type cables onto the existing ones amp outputs and just connecting up to the 2nd set of sp inputs. Result ; an EL34 failure on my bridged Rachaels. Scrubbed that idea and got back to normal. Then later there was an intermittent cut out on the right channel. To remedy it I found I had to touch and jiggle a little the i/c on the CSP2+ pre out. Must be the i/c I thought as they were a bit stretched because I use  1/2 and  1 metre i/c`s to join up to the Rachaels, either side. No big deal I thought, it only happens every couple of days. This is all 9 months ago

So, reel forward, the ZP3 and CSP2+ go in for the jupiter caps. They come back.
I`m looking at the pre/outs on the CSP2+ and one of the black marker lines is missing. Hm, whats occuring ? When I look at the invoice it lists
1 pot replaced cost $0 !
No more channel probs.
I`m thinking how did he find it ?
Now thats thorough !