My 60CSx expired on Friday

, at the lunch stop in Cassel (between Dunkerque and Ieper). It wouldn't turn off, so I pulled the batteries out, after which it wouldn't turn on. At least it was an opportunity to rediscover the fine old art of navigating off a map in the back pocket
On return home, I checked out the cost of sending it off to Garmin for repair ($150 flat rate for out of warranty repairs), and decided to have a go at fixing it myself, since it was probably a switch that had become displaced rather than anything complicated.
In case anyone else needs to take theirs apart, this is what I did...
To disassemble:
1) remove the 6 screws holding the back on (2 at top end, 4 under battery compartment lid). The port covers can remain in place
2) prise up the back half of the case, inserting small screwdriver between back case and seal, and twisting.
3) At the top end, the top part of the case and aerial cover is glued down. Break the rear case section free of the glue (quite easy - it's sealant rather than structural).
4) Reach under the rear case and unplug the 4-wire mini-USB port connection. Leave the coax for the external aerial connected - there's sufficient slack.
5) The main circuit board is held in place by a transparent plastic clip that covers most of the top half. At the bottom end, unclip each side with a small screwdriver - insert, twist, and lever up. You have to bow the sides of the main case outwards slightly. With the lower end of the clip unclipped on both sides, lift a little and pull downwards to get the top end out from under the case mouldings, after which it may be removed.
6) The main circuit board may then be removed by prising up the bottom end so it just clears the end of the case, and sliding it downwards so the aerial is pulled out of the tube in the top half of the casing.
As I had thought, there was a small microswitch that had been bent down. I straightened it, and added a small piece of plastic between the back of the switch and the top of the display as a brace, and reassembled. I've just pressed the top rubber cover back down rather than trying to re-glue. It's outside the main waterproof seal, and the existing glue seems to have been tacky enough to just stick back under finger pressure. I expect I'll just have to wait and find out whether I've disturbed the waterproofing too much.