Okay, so I have a friend that was flying and the thing just took off to one side and dropped out of the sky. It fell on some rocks and got a bit of ocean spray on it. He ended up aquiring another one and just put this one to the side. I asked him if I could have to since he was just going to trash it, he agreed. Now help me get this thing going. Only 1 motor seems to work at full potential, 1 doesn't move at all, 1 is kinda jumpy then it'll kick in, and the other is slow as hell. I opened it up and didn't find any corrosion around any of the connections. The battery is dead I believe (keeps flashing red and beeping), the meter says it's at 5V. So I need to go to his house to charge it. I was going to see if there was voltage going to the motors first. What other troubleshooting can I do? At power on, the cycle doesn't show any errors. I'm not sure what kind of maintenance, if any, he's done with this thing. I was assuming that the motors just hit the bed, so I was going to buy 3 new ones. Could a rebuild kit fix them maybe? That would save me $30. Also, what cheap/easy upgrades should I do first? Drill holes and rubber grommets for oil maintenance, prop balance, etc. Thanks for your time and help! I greatly appreciate it.