We have a 4-lamp magnetic ballast that is on the blink. The ballast is a Mark
III Energy Saver made by Advance Transformer, catalog number R-4S40-A-TP-AC.

This ballast is a magnetic ballast and costs $60 to replace. I can be a 4-lamp
electronic ballast from Lowe's for $30.

Is it possible to swap the bad magnetic ballast with an electronic ballast? If
so, are there any modifications that I need to make to the 4' fixture?