As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: HIGH PITCH SQUEAL COMING FROM THE 2R DOOR DURING DESCENT. PSI WAS 7.6 AT FL 230 WHEN IT OCCURRED. VISUALLY INSPECTED DOOR 2R PER AMM 52-10-00. FOUND NYLON STRAP FROM DOOR SLIDE LOOSE ALLOWING STRAP TO BECOME LODGED BETWEEN DOOR SEAL AND DOOR LEDGE. RE-SECURED STRAP TO PREVENT REOCCURRENCE.