I think these have the calibre 60 which is an ETA 2892-2 base with a Dubois Depraz module on top. Most watchmakers can service the 2892 but the DD module is a bit trickier. They can be serviced without issue, unless they need parts... You can't get parts for them at all. There's a fair amount of work on top of the base movement service and many won't touch them. If you're interested, I rebuilt one and put photos on here a few years ago (similar module).
TAG would replace the module if it is out of spec and you're very likely going to find that their costs will be comparable to anyone else because of that.
Crowns and pendant tubes are usually available but I have not seen those covers before and I suspect you'd need to go to TAG for them.
In this case, if I were you, I'd go back to TAG.
Hope this helps, Chris
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