Easy success. I was able to slide a #11 blade under the headlight base and slice off the bottom of the mounting lugs. (This leaves enough lug remaining so that the headlight can be remounted with a touch of CA on each lug.) The headlight then can be pried loose from the base. I then put the headlight face down on the bench and with a little pressure with the #11 blade in the seam on each side of the back the two halves pop apart. Be careful not to lose the lens as it is loose in it's slots. I expect no issues mounting the led and remounting the headlight. However, I will wire it directly to the decoder feeds using a small disconnect and not use the sliders on the inside of the boiler as I am also eliminating the PC board. Thanks for the initial hint.