Through different Aurora forums I was informed to replace the rear (red) fog lites bulbs one had to remove the rear bumper outer cover.
I found this a major operation to undertake and after looking under the rear bumber I found they can be replaced by sticking your hand inside rear cover and twisting out the holder, it has than just enough wiring that you can replace this bulb. Replaced both bulbs and now anybody can see my car in the fog which rarely happens here in Canada :lol2:
Bulb # is 912 $10.40 Can.for 2 at the General and $2.00 Can. for 2 at AutoSource includes 14% tax. Go figure.

I think there is a way to do it from the trunk.

Everything thru the General is usually much more expensive. I'm new to this post but I try to do my research as a lot of GM's stuff is outsourced. The "horsepills" for the cooling system, the combustion leak detector, most of their specialty tools, the shop manuals are just a few I can think of.

I think there is a way to do it from the trunk.
No there is not. :shakehead