when i pull the high beam lever, the high beam works fine but, it stays on eventhough the lever is back in center position. i need to push the lever lightly toward dashboard until high beam shuts off. high beam also sometimes goes on while turn signaling.

what do i need to replace or repair?

 

If your car has the active headlamp system what you are seeing with the turn signal is the cornering lamp coming on as well as the headlamp itself moving in the direction of the turn once the steering wheel is turned.
There is probably nothing wrong with the headlamp high beam operation - the detente might be a bit soft and you are probably going past it when you pull the lever.