Does anyone know how to fix a Sebo K3 canister vacuum that stopped suddenly while running and won't turn on? The cord is OK, because the power button lights green. The manual says there is a "manual reset" that happens if the machine overheats or is clogged or any number of other reasons. I have changed the bag and both filters, cleaned the brushroll, checked everywhere for clogs. The vacuum always feels quite hot the 3-4 times I've used it, but I have not seen the warning light go on (it is several years old, purchased by my MIL and recently given to me when she can no longer live independently).