Just found this.
• A pylon flap system, installed on the trailing edge of each pylon, provides increased aircraft nose-down pitching moment in the event a deep stall is encountered.
• Moving either control column to the forward stop activates the system. The pylon flap surfaces move from neutral position to fully deployed. Moving the control column off the forward stop causes the pylon flap surfaces to return to the neutral position.
• The blue ELEVATOR AT LIMIT light on the OAP illuminates to indicate that the pylon flaps and the elevators have reached the full down position, and will also illuminate to indicate full up position of the elevator.
Sounds as if when you do a full movement check if you don't get a blue limit light you have a problem with elevators or the pylon flaps, trouble shoot to find which is not bringing the light on.