Does trans fluid wear out

Find a place that has a good obdII scanner & make sure they let you see the results. Many times a trans malfunction will not trip the light but it will show up in the computers history.....Many trucks can not be read by a typical inexpensive scanner as they are non obdII compliant. When I get a chance I will check the software on mine to see if your truck is listed as one of the ones that needs it own software....