I know there has been a lot of info on LED bulb replacement because I looked through quite a bit of it. Products come and go though and I thought it might be useful to post some details on mine. Also ... before I got started, I couldn't find much info on how to get the puck covers off the ceiling, so I've included my info here.
My coach is a 2009 Nimbus which we bought a few years ago. The previous owner had replaced some of the halogens with LED but they were dim or not working.
I chose a 1 watt G4 6-LED bulb that I found on Amazon. These are the flat disks. They were $11 for 8, so $1.38 each. I was mainly worried about them fitting in the tight space, so chose to go small. Amazon link: EBD Lighting 1W G4 LED Light Bulbs(8 Pack) Equivalent to 10W Halogen Bulb,...
These are no-frills LED bulbs - they came in a manila folder with bubble wrap. They were still stuck together from the factory - you had to snap them off of a string of 2-5 led bulbs connected together. That was a little worrisome but they all worked & I did 53 lights.
I have two types of ceiling pucks - the antique brass and the glass. The antique brass pucks pry off if you use a sharp knife on the inner brass rings. They just snap in place. The glass pucks unscrew. As you look up at them, rotate counterclockwise a half turn. Both required a fair bit of force to unsnap or unscrew. I was fortunate in getting everything off without breaking them. Some of the glass pucks don't feel that secure after I screwed the glass back in. They are held in by little plastic nubs and the nubs are probably worn a bit.
Failure mode on the old LED seemed to be mainly heat. A lot of them were discolored. Many of the dim ones only had one or two led's working on the disk. For a device that is touted because it uses less power, it sure seems to cook itself with the power it draws. Glad I went with the 1 watt disks.
Pictures below:
Failed LED's -- these are the LED's I found that had failed. Note the discoloration.
Brass Puck & Cover - details on the puck. Just get something sharp & sturdy to pry it off. I used the tip of a potato peeler.
Glass Puck & Cover - details on the glass puck. I was able to unscrew it but it was touch and go. I've read that others needed a spanner.
LED's that fit in the Pucks - these are the various shapes and sizes that I pulled out of the pucks, installed by the previous owner. I chose the smallest and lowest watt that I thought I could get away with but I could have upsized.