I took the dash off based upon the information from the service manual that said you had to do that. Let us know if you are able to somehow get to it through the light switch panel. I don't think you will, but I will be more than happy to look foolish if there is a better way for other people to do it.
Well... not to make D Britt look foolish but... it was too easy the other way.
Steps to do it:
1) Open up the left-side access panel (with the starter and light switches). To do this, you merely unscrew two philips screws which are at the bottom (in the cubby hole), then, while pulling the (just-released) bottom out slightly, stick a slotted screwdriver in at the top of the panel and twist it so the plastic hooks at the top disengage. Don't try to just pull it out or they will break (HRM broke them when they put in my driving lights a few years back (but they were also quite nice about getting me a new panel)).
2) Once those hooks are free, pull the panel away. You should have enough length with the light and starter harnesses to just let the whole thing hang down in the footwell. Within you will see mostly a great mass of foam. Using hands and/or some long-nosed pliers, yank and wiggle the foam till you've gradually worked it all the way out. Once out, it looks like this (photo 1). You should then see the CDL unit mounted on the shelf.
3) As D Britt said, you can just wiggle the bus back and forth till it comes off the CDL unit. Pull it free (photo 2).
4) You can now clearly see the CDL unit mounted inside (photo 3) You'll need some short-handled or racheting philips screwdrivers to unmount it.
In the final photo (#4) I have reattached the now-unmounted unit to the bus, and show the two bolts and washers that held it in place. You can also see the trim panel, with the lights and starter harnesses still attached, hanging down to the right of it.
No cut hands, and all-in-all it was much easier than getting at the Cobra unit on the right side of the car (I did get cuts from that!).
Now if only my parts dealer had a new CDL unit in stock for me (he is ordering one). Hope to have it by next week.
Meanwhile, the Cobra fob has been put in a drawer. Now that I finally got good range on that thing, I don't want it around till it can unlock my doors again as well as it locks them! On second thought, I imagine the alarm itself will still work just fine without the CDL unit. Will let you know.