Thank you both for your help. I guess this is probably a designed failure/service enabler. Obviously, ANYTHING underneath a car is going to get desimated by sand, water, salt (likely), and all kinds of other abuse. I've been under the car a bunch, (unplugged both sensors hoping that would do it), and can see that they're just cheapoh switches - NOWAY they should cost more than $10. Oh well, it is what it is.
The one other thing, now that I think about it, that has me concerned is: What's the likelihood that BOTH failed at the exact same time - because both driver's and passenger's side is 'failsafed' at max pressure? You know what I mean? If a sensor went bad, then just that side would be max'd out; wouldn't you think?
Oh well, at least I feel I'm a lot closer to the problem. Now I just have to come up with the coin to buy them for between $600 - $800, buy a funky reverse-torque bit socket, hope they're not too rusted, and swap em' out.
Ah well, at least I'm above ground!!!
Thanks again folks.
Jay Pilkington