As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THIS IS THE 3RD BROKEN BELT WITHIN THE LAST 8 HRS OF ACFT OPERATION. THIS PROBLEM DID NOT OCCUR UNTIL THE BELT CHANGED FROM RUBBER TO PLASTIC (OR WHATEVER IT IS MADE OF). THIS BELT RAN FOR ALMOST 2 HRS. SUBMITTER SUGGESTED GOING BACK TO THE RUBBER NYLON DESIGN ASAP.