Trim switches (2 of them ) are not responding. For example if I work the elevator trim forward or down , I can't move the trim back up. Also the elevator on an aircraft does not move. Same response if I switch planes on the receiver. Battery is original and was displaying 7.2 volts. Maybe I should order in some replacement trim switches..

Any ideas please. On vacation in Arizona and not being able to fly while down here will truly suck.