What should be done if there is a transmission pan leak?

When dealing with a transmission pan leak, inspecting and replacing the gasket is the most appropriate course of action. The transmission pan is sealed by a gasket to prevent fluid leaks, and when this gasket becomes worn, damaged, or improperly seated, it can lead to fluid escaping.

By inspecting the gasket, mechanics can determine if it needs to be replaced or simply resealed. Replacing the gasket is a relatively straightforward and cost-effective repair that can effectively resolve the leak without needing to address more serious issues.

On the other hand, replacing the entire transmission is excessive for a gasket issue, potentially leading to unnecessary costs and effort. Flushing the transmission fluid may not directly address the leak, and could lead to further complications if the fluid level drops too low. Checking for electronic faults is also not relevant to a transmission pan leak, as it pertains more to issues with the vehicle's control systems rather than the physical integrity of the transmission itself.