Low voltage halogen lights

ummy

I also have a query about a low voltage halogen light set up. I have 6 downlights in kitchen - 2 banks of 3 lights in each bank. One bank of 3 have failed and I am told it is probably the transformer. There is no access from the floorboards above and I only have the small openings from the lights for access. Where would I find the transformer ? Tried pulling some wires from the lamp fittings but to no avail - nothing moving and frightened to force it.

Also I am trying to access the void thought the small section having taken the bulb out - will I get better access by trying to take out the chrome "facing" to the bulb on the ceiling - I can't seem to get that out very easily and frightened that perhaps I shouldn't force it off ?

And if I do get it off, where on earth might I expect to find the transformer ?

It's probably quite a simple job and I don't want to pay a packet to an electrician when all I need to do is replace the transformer.

Would love some advice ! cheers