OK, both boards are out.
On the CPU - I'm getting

The Q13 is reading 504/540 on the DMM (which I don't know whether is actually .504 etc)
The Q12 is reading 501/543
The Q11 is reading 504/546

On the PPB

The Q1 - strange readings all over the shop

I measured the Q1 with red on lug, black to legs...So I'll pop down buy some TIP36C and see how we go!