TL-Electro - Top Cover Removal

Hello and welcome to the forum teuvin ...

These are 2 items that should be of help as resource links in the repair manuals thread here: yashica.boards.net/post/8624/thread . The TL-Electro X exploded view should give an indication of how things are connected, and in what order, and the repair manual for the same model might help with the electrical part of the shutter functions, but won't be too helpful on the mechanical aspects.

Removing the spotting on the metal may not be an issue if you can identify what it is, and if it's only on the surface, but it could be a far different fix if it's caused from pitting and/or chemical 'etching'. I usually start with the least destructive and non abrasive cleaner first (90% isopropyl alcohol), then on to something to dissolve anything stubborn or sticky (Goo Gone, etc.). Hydrogen Peroxide can lessen or remove some black molds from metal, and cider vinegar is great for some rusting or green/black colored oxidations or 'leaked battery' surface remnants. Naphtha (a.k.a., lighter fluid), Acetone (i.e., fingernail polish remover), or other volatile solvents should be tested first to see how destructive they might be to coatings

They might not be 100% cleanable, but can be lessened in appearance. Flitz Polish works wonders on camera metal brightwork and plastic casings, but it is abrasive and removes finishes. Lustre is easily changed from dull/satin/matte to shiny, while it removes green or black oxidation too, so it can be overly  aggressive if used too much.

After reading biggles3 's Peterr's comment and the linked article, I think the internal split-spindle part of the rewind assembly is what's keeping the top in place. Put the rewind crank back onto the rod temporarily for grip and leverage, and then unscrew the rewind rod that catches into the top of the film can, from inside the film chamber. Put a screwdriver shaft into its slot to hold it in place while you unscrew it from the top.

That last picture of yours shows there's a notch in the ring that's under the rewind knob. That notch means it unscrews. It's there to engage a wrench into. There should be one opposite too. I think you need to unscrew that.

My sincerest apologies to @peterr for mistagging his reply and attributing it to biggles3. I can only offer the early hour I'd posted it, and a senior moment as a multiplier for any possible reasoning it happened. Thanks to bobblehat for his eagle eyes in spotting my faux pas.

.