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The transmission fluid life counter left unreset after a fluid change. The module estimates fluid condition from accumulated temperature and load rather than measuring it, so the counter is its only knowledge of what is in the gearbox.

Fresh fluid with an expired counter means the module still believes the fluid is degraded, and it will act on that: restricting lock-up, raising line pressure, or reporting a deterioration fault. The complaint is a transmission that behaves differently after a service that went well. Clearing codes does not reset it — the counter lives in adaptation memory and needs a commanded reset. Establish whether it was done before diagnosing anything, since it is the likeliest explanation for a fault that began at a service.