First thing I'd do is drop the oil pan and go from there. If there aren't pieces or shavings of metal then cross your fingers. Fill it up with new oil and find someone to find out what code/s are stored. A welfare edition code reader won't read transmission codes. Most shops with a half assed scanner should be able to look up what's going on. I haven't heard of anyone rebuilding cvt's personally, everyone seems to be afraid of them.
A dealer could probably tell you what the codes are but I highly doubt they'd ever attempt to actually repair a cvt. They usually just replace them rather. If that's the route you're planning might as well just go buy another car. Like Dirk said, used ones are cheap. That'll probably be the best bet if you can't figure out what's wrong yourself.
You can download a service manual for a 2015 Mirage from russia. Google it or do a search.
As far as interchange goes, you obviously didn't want to look it up yourself I did it for you. Late 2014(after 4/14)-2019 will work interchange according to https://www.mitsubishipartswarehouse...c-transmission They all use the same part number.
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View my fuel log 2014 Mirage SE wussie cvt edition. 1.2 automatic: 37.7 mpg (US) ... 16.0 km/L ... 6.2 L/100 km ... 45.3 mpg (Imp)