So, next time I am in the F/D checking the oxy pressure (as per the transit chk) and I smell an electrical arcing smell and see the window heat light flickering, I would be going out on a limb by investigation the possibility of a loose power terminal connection on the windscreen with a possible cross threaded terminal screw etc.
I was once admonished for bringing to the company's attention that an engine fire extinguisher bottle was out of date. Told that it was not part of my pre-flight inspection.
And that was about 20 years ago.