List of Standard Fixes for TOMY trains?

Honestly, there are many problems these trains can get, it can range from minor ones like a stuck gear in the motor that only needs a twist to get it going again, and there are serious ones like when the batteries leak in a talking engine and the corrosion destroys the circuit board, I should be able to help you fix some issues but you should look to the YouTuber 'Custom Trackmasters' if none of us can help