So - devil's advocate, did they put the correct fluid in it? CVT's sh1t themselves proper like and in very short order if filled with the wrong fluid (ATF looks and smells the same and if the boys are on Monday morning or Friday avo mode well yeah).
I'm not entirely sure how the mitsi spec versions work, but effectively there are two 'gears' in most CVT boxes - forward which has a clutch that engages the expanding drive pulleys and then reverse which from what I know of CVT's is engaged via a separate shaft and clutch. You don't give the year of the vehicle but most times theyare fitted with a transmission control unit which can give specific fault codes - if this isn't the case or it's popping up a 'generic' code the only real way forward is to plug test gear into every available port and see what it's not doing. The fact that it's not going into forwards when hot and seems to function correctly once it's cooled off is a sign of something as well...
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