The rain has set in up here so I haven't been able to run Grumpy's test as yet.

To further clarify, I have been running the machine on these slopes effortlessly for a year without having to run the engine hard and without a trace of the clutch slipping.

The machine has been maintained , serviced and driven carefully.

The clutch does not show obvious evidence of significant wear.

The squealing has commenced only over the last hour of use.

As soon as the weather fines up I'll retest things.

Thanks again all for your assistance.