Tractors

Purchased a Poulin Pro 54" last month. Two problems: 1. Deck lift lever detent unit has popped out making it difficult to select a deck height. I am unable to get it back in place. 2. Transmission forward/reverse pedal has problems. Travels forward as designed, however, cannot back up by stepping on reverse pedal. I have to reach down and manually pull the pedal back to reverse. The transmission frequently locks up in reverse, unable to move the pedal forward. I have to get off and manually unlock the transmission from the rear to be able to go forward.
Solutions?