hello im working on my easi r 30tt and the mast goes up no problem but as soon as you release the raise switch it starts coming down it drops approx 3 feet then stops and continiues to creep down untill it hits bottom any help would be appreciated also if the lift is raised and you turn it off then on the mast drops all the way and if you just tap the up and release it the mast drops its like a bad check valve but im not sure where it would be located