How do we fix a selnoid A, B and D Malfunction. When the Van is warm runs great on 2002 Kia Sedona

When the Van is cold it downshifts and seems hard to shift but onced it good and warm runs prefect, how do I get this repaired I want to know what it entails so I dont get ripped off seems to be a big thing around our area exspcially when it comes to a forgein car!

Asked by for the 2002 Kia Sedona
Transmission service, drain and refill, should be no filter to replace.
Okay If that dont work then what??? And Cant seem to find a drain plug on there can you pin point me in the right direction
it's at the bottom front center of transaxle, drain completely, change drain plug washer, fill with 2 qts.
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