The ticking and everything you describe sounds so similar. On my Zed the packing between the window and dash had moved slightly and was always a bit of the sparse side, this produced a kind of ticking, sparking sound, thankfully it wasn't, was a simple as a bit more packing. Hasn't done it again in the last year and a half. Presuming you'd be able to buy the packing from your local dealer.
Anyway, whatever it is, let us know how you get on. I could be wrong.
ps. Is your Z still under warranty?? If so get the dealer to have a look next time you're in.