Well if you not setting any codes such as 1870 and they are not deleted in tune , I would think its simply not being commanded I would get it on a scanner or tuner and look at whats being enabled lockup wise first, Also since this happened after a day at the trans I would consider it may be engine missfire, This may not set a code yet still be present, But first things first get it on a scanner , Look at the data stream and see whats happening
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