[Gillian]

I once carried out a service call for a cooker, the company I worked for never did get the right parts in!
A previous engineer had visited this job, a fan oven with noisy fan.
They had ordered a fan oven motor, when I checked out the cooker prior to fitting the motor. It was the cabinet ventilation fan that was making the noise and the customer was already unhappy about the time taken to order the first part.
When the customer was out of the kitchen I found some cooking oil and put it on the sintered bearings with a screw driver.
I left the company after only one week, they were so hopeless, so never heard any more about it.
It saved my ears getting chewed off at the time, at least the customer was left happy!