ive got one account that is nothing but an irrigation cluster f..k. Just as i took on the account i had to replace the box, which the customer said it was the third time. When i replaced the box only 3/4 of the stations worked but the owner said they all worked before i installed the new box. Ever since i replaced the box i loose stations by the week and am down to 2 working now. I tested with a multimeter at each valve and the all have power. I am going to start replacing salenoids next week. WHAT ELSE AM I DOING WRONG? OR IS THERE SOMETHING ELSE I NEED TO CHECK?