2010 Cayman S - Rear demister only one line works

[Dracoro]

Hi

Middle line in rear screen works when demisting (frozen window this morning, so a good test!).
All the others do nothing.

Any ideas on cause? A cursory glance didn't reveal any obvious broken lines that I could see.

[elan362]

Failing battery and the car ecu limiting power drain?

[Dracoro]

Rest of car is fine, no known battery issues, starts on the button etc.

Given one line does work, I am assuming some break in delisted circuit somewhere, or connector (not sure where that is) has bad.loose connection?

[Dracoro]

Forgot to update, a new rear screen went in a few months ago. Dealer/warranty contributed so didn’t cost me too much but only option is genuine rear screen, no pattern parts really…

Anyway, all working now, was just aged/broken demister lines.