Denford Triac Toolchanging Issue

[GingerNinja54]

Since having the machine, I've had a few issues, mostly now overcome thankfully!
Something I did NOT have an issue with was the toolchanger...
I had full funtionality, but the last couple of days has seen this go 'bad' and the drawbar doesnt seem to be unclamping when the atc raises the tool into the spindle and the tool wont mount into the spindle.

I was playing ('learning'!) all the functions previously, and this may coincide with me hitting M24/M25 drawbar clamp/unclamp in MDI... Wondering if doing this disturbed or over extended something that was previously ok when auto toolchanging… somehow?!

Looking in the main cabinet, the ESR is engaged. as well as another relay (unmarked) lower in the cabinet. Any relationship?

I've got a small air leak from the regulator I'm got to fix, but that's been there all along...

Was just getting things close to sorted, even working our Fusion360 for both CAD and CAM, so I'm gutted I've not got another problem with the machine!!
Any help gratefully received!!