As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WE HAVE BEEN DISINFECTING OUR FLEET OF A/C DURING COVID CONCERNS. THE PILOTS HAVE DISINFECTING WIPES PROVIDED TO THEM. BEFORE EACH FLIGHT THE PILOT WIPES DOWN AREAS OF TOUCH POINTS. THE THROTTLES HAVE FRICTION LOCK FEATURES THAT ARE COMPRISED OF WASHERS. THESE WASHERS ARE GETTING WET AND SWELLING WHICH IS CAUSING THE WASHERS TO BIND THE THROTTLE CONTROL AND IN A FEW SITUATIONS LOCKED UP THE THROTTLE UNTIL AND HARD PULL WAS USED TO FREE THE CONTROL.