PIWIS report would be really helpful. TCM controllers are very good at logging faults, even if no lights are illuminated in the cluster. If a fault is stored the tech can look at stored data at the time of even (i.e. ATF Fluid temp sensor) and get a good idea of where to go.
The vac. valves do fail regularly, so even if you need a more in depth trans repair, it is worth replacing regardless.
Skoot
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