Our Bradford White electric 75G water tank (almost 9yrs) started leaking from the bottom and there was a lot of rusty sediments. Since there's very little clearance from the floor, I could not see where the leak was coming from but there were at least 2 spots where the water was dripping out of. I called a plumber that I know but he wasn't available for a few days so I first turned off the unit and drained the tank. Then I put a pan under directing it to a nearby drain and filled it up again and started running it again. It's been 4 days now and it hasn't leaked. What is going on here and should I still call the plumber and get it checked out?