OB Bear, I'm betting your windows were probably mfg by SE-GI.
Here's the website of some folks who do a great job of repair and/or replacement of dual pane windows:
We had the same problem with our windows from SE-GI. Fortunately they replaced all of ours with me paying shipping cost and doing my own installation.
When our cockpit window inner seals wemt bad I called but they no longer stocked that size.
On a trip to WA state we stopped off in Vancouver where Motion windows is located, and had new windows fabricated for our rig at a cost of $1,200.00 which included installation.
They're really nice folks and it's family owned and operated by Tom Kemp and his sons.
Best of luck, Jim