I went to the DLT to renew my 5 yo licence
Documents
Application Form
Medical Form from local hospital 100baht
DLT Online Computer Test Certificate
Copy Yellow Book
Copy Passport
Copy Visa
Copy Entry Stamp
Expired DL
Service was good, friendly and fast, the whole process took a little over 1/2 hour
If you are renewing a car and MC, you will need a set of documents for each