Opened up the motor block to check the interior - looks ok and no obvious problems...
On deeper inspection found a big hole in the front plastic drive gear, lost a tooth and a bit more - DOH !
So not much option for me than to replace the motor block, fortunately I had a similar one available and started work adapting it to fit - offering up to the footplate section it needs a fixing at front and a few padding pieces...
The replacement motion with adaptations to fit the loco body (using a fixit block at the front)
tender coupling mk2 - a simple hoop of wire - does the job
All re-assembled and on a running test with 4 coaches, occasional slippage so will fit a traction weight on top of the motor block - loco works fine and reverses too with problems (so MK2 coupling a winner)
next job is to tart up the paint work.
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