M1 partial maintenance vs M2 complete service for quartz chronograph?

I have a CAF1010, which is an ana-digi model (ETA E20.321), and I plan on sending it to TAG at some point to have the battery replaced, gaskets checked / replaced and the exterior cleaned, as it is a bit dirty from the previous owner.

As far as I can tell, the watch is running perfectly with no issues, the digital display is a bit dim for my liking, but that’s probably just because it’s a negative display and I’m used to positive displays.

My questions are, is the complete service worth…

M1 partial maintenance vs M2 complete service for quartz chronograph?

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SMP Losing Time: Would You Advise OB or Service Center?

My SMP is losing between 1-2 minutes per week. I would imagine that it simply needs the movement to be regulated but of course, I have no way of knowing this. It has 2 months of warranty remaining, so hopefully this will be addressed with no out-of-pocket costs but that aside, is this something my OB can address locally, or should I ship it to an Omega service center? I’d appreciate your suggestions.
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