SSD
Don't pay up!!!
I also had a GPS III Pilot that went t
ts up and I spoke to Garmin telling them that I was sorely disappointed and I had been mid flight when it happened (which I was).
They were very apologetic and sent me a free "overhauled" one which works a treat.
This was only about two months ago so I would push a bit harder if I were you and I'm happy to let you quote my name and address when you speak to them so you can request "similar customer service" from them!!
PM me if you're interested.