BOSTITCH NAILER - LEAK THROUGH TRIGGER

Question

I JUST STARTED A DECK PROJECT AFTER NOT USING MY NAILER FOR A FEW MONTHS. IT STARTED LEAKING AIR THROUGH THE TRIGGER AREA AND DI NOT FUNCTION. THE LAST TIME I USED IT - IT FUNCTIONED WELL. HOW DO I FIX IT AND WHERE DO I GET THE PARTS. THANKS, ED