For fun, I tried repairing a Cobra, it is easier to take apart than the puck-shaped computers. Long time ago, someone on internet suggested Digikey #223-1410-5-nd. A hot-air solder station is necessary. Positioning the sensor so it lines up with the hole in the bottom of the case is difficult. Inserting the two skinny o-rings and washer is difficult, plus I can't figure out what order they should be in, they just scatter when the case is opened. The springs go into orbit. After assembly, I think there was a leak and the computer still doesn't work. And it might have to be calibrated using unavailable software. I have a shoe-box full of Cobra computers with bad depth sensors.
So I bought another Cobra off of the big auction website. Arrange with the seller they will take it back if it doesn't work. Many people selling them don't know anything about the item or say it worked on last dive (five years ago). Dried salt crystals and sand can work like a saw to ruin the sensor long after the first intrusion. I bought a Cobra 3 that worked but only for 20 minutes then it went berserk. 'Sent it back for refund. If I sell one, I test it in a chamber the day I ship it and include a printout from the Suunto DM5 software so the buyer knows that much.
But good luck and report what you find.
