[Closed] Calling all plumbing experts - Boiler getting flaky

My boiler has a fan unit with a small motor. For years, each year, I have squirted a shot of WD40 in the worn noisy bearings. This minimises the noise very significantly.

I've been doing this coz you can only buy the whole fan assembly priced at £125+.

The frustrating things is that all it needs is a couple of £2 bearings, but it doesn't look like I can get at them and I'm not sure my bearing puller is the correct size.

Does anyone know of a supplier of cheap refurbed/alternative boiler spares?

It's a Gloworm Ultimate 80FF.

Cheers!