I also replaced a couple of the TIP102's. Query - I used diode MM test on the TIPS and when in circuit they test 45/49 - is this about right?? out of circuit is closer to 45/60 (grounding centre pin). will test the board in machi9ne tommorrow.

I don't have a huge success rate testing with a meter, and often rely on the 'in machine' test.  If it works in the machine I would not worry about it.  Keep in mind that it is not always the TIP that plays up, and the CA3081 (transistor pack) can also go open and cause a coil to lock on.  If you have a problem (coil locked on or won't fire) check the schematics and then test ALL the components that fire that coil.

cheers
Ian