It's pretty plain forward to install. But you might want to check with local codes to see if that BF is still compliant. Nothing worse than going through all the trouble to replace only to find out that it is the wrong one. Once you get that installed you can move on to checking the system. Just do a quick manual start and see what you have. If you notice anything and have any more problems, post it on here and we can help!
Josh
Irrigation /Landscape Lighting / Pump and Well Specialist