2005 toyota solara convertible rear window defroster

I bought a certified '05 solara in October 2009. Defrost didn't work; several dealerships 'tested' the grid and said it coded fine. I contacted the '800' Toyota customer service line and the rep agreed that the defrost should do something when engaged and submitted a ticket for me at a local dealership to resolve the problem. When the service manager finally witnessed himself no change in the window he tested the grid lines again following all the way across the window. He found that while the grid lines had full current on either end, he tested across the window and by the time he reached the middle of the window, the current had continuously diminished until it was nonexistent. After all said and done, Toyota replaced the top because unlike Chrysler (my experience with both the LeBaron and Sebring convertibles was fantastic: I put 200,000 miles on each with rear defrost that worked fantastic with no problems) you can't just replace the rear window.
However, less than one year later the defrost tabs had detached and the vendor that installed the top reattached them; now, less than another year later they have detached again and I'm told by experienced auto glass and convertible top reps that once a defrost tab has been reattached once, if it comes detached again, it will never remain attached after that and that the top is essentially defective because the tabs detached within the first year of installment. The vendor with whom the Toyota dealership contracted to install the top is battling with their supplier to replace the top. It isn't looking good.
Bottom line: the rear defrost in the 2005 Solara is a poor design. At the very least, it should be designed such that one need only replace the glass instead of the entire top. A definite shame since I very much like the rest of the car design. It's a fantastic convertible otherwise. I bought a certified '05 solara in October 2009. Defrost didn't work; several dealerships 'tested' the grid and said it coded fine. I contacted the '800' Toyota customer service line and the rep agreed that the defrost should do something when engaged and submitted a ticket for me at a local dealership to resolve the problem. When the service manager finally witnessed himself no change in the window he tested the grid lines again following all the way across the window. He found that while the grid lines had full current on either end, he tested across the window and by the time he reached the middle of the window, the current had continuously diminished until it was nonexistent. After all said and done, Toyota replaced the top because unlike Chrysler (my experience with both the LeBaron and Sebring convertibles was fantastic: I put 200,000 miles on each with rear defrost that worked fantastic with no problems) you can't just replace the rear window. However, less than one year later the defrost tabs had detached and the vendor that installed the top reattached them; now, less than another year later they have detached again and I'm told by experienced auto glass and convertible top reps that once a defrost tab has been reattached once, if it comes detached again, it will never remain attached after that and that the top is essentially defective because the tabs detached within the first year of installment. The vendor with whom the Toyota dealership contracted to install the top is battling with their supplier to replace the top. It isn't looking good. Bottom line: the rear defrost in the 2005 Solara is a poor design. At the very least, it should be designed such that one need only replace the glass instead of the entire top. A definite shame since I very much like the rest of the car design. It's a fantastic convertible otherwise.