The laser has been sitting around with lots of other laser bits crying for repair. It had a dead diode and laser driver board which had to be replaced. It took over 30 combinations to get a pair that worked. The outcome is a 100mw RGY laser that has pheonix like risen from the ashes after nearly six months of sitting in post mortem mode on the workshop floor.
There is no better way to get to learn about your products than to reassemble them from scratch. A long exercise but now I can return it to its out of warranty owner. The laser is about 3 years old.