[Note: This posting was made at same time Andy announced his success...consider it only for your edification if you haven't worked on a Calc. before]
Andy - Simon is right, proceed with utmost caution, particularly taking the module out. DO NOT GET CURIOUS(yelling for effect, only) about the layers of the module....there is a thin plastic substrate that keeps the buttons from contacting the module board - you move that, you are shot. And yes,the wire bonds are TOTALLY open - don't get curious on a potential/part worker.
And now the actual buttons: DO NOT TURN THE WATCH CASE OVER!!! Sure, there is a rubber membrane to keep the buttons up off the module and to seal it from moisure, but over time they get loose and floppy. IF you turn the case over, you may be faced with either trying to turn the buttons back to their correct position with a needle(this can be done), or removing the membrane to do it from the back side - no fun either way. IF you are worried you might do something crazy like knock it off your workbench, I suggest you cram a piece of foam into the cavity and snap a rubber band around the case to hold THAT in, before getting into the module.
Good luck...let us know how it goes.
I am so glad to get back to something constructive here.
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Nov. 2022 - back in business!! BItter divorce is in home stretch, come grabs some great deals, I had to open the safe . . . damn attorneys. piss.