On 16:13 27 Aug 2020, newshound said:

I have a Brother HL-2365DW which I guess is rated for SOHO rather than
heavy business use. I'm getting toner spillage leading to (fused)
blotchy marks all over printout, I guess the waste toner collector is
full. (it's probably had ten or more new cartridges). But I can't
immediately find any reference to this sort of problem on the net. I can
see that some heavier duty machines have a removable and replaceable
collector but I can't find anything for this model.

I thought I would ask for tips before trying to dismantle it.

TIA

This page says on that model the corona wire, which is what I think you are
referring to, is inside the cartridge not the printer.

https://support.brother.com/g/b/faqend.aspx?
c=gb&lang=en&prod=hll2365dw_eu_as&faqid=faq0000020 8_042