As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT DUCT PRESSURE SLOWLY FLUCTUATES BETWEEN 18 AND 25 PSI IN CRUISE, FL 360. RIGHT DUCT PRESSURE STEADY AT 40 PSI. GROUNDED - YES. T/S SYS PER FIM 36-10 TASK 804. FOUND CONTROL SENSE LINE (BROKEN) LEAKING TO THE 450 F TEMP. REMOVED AND REPLACED CONTROL SENSE LINE (3) PER AMM 36-11-04. OPS CHK NORMAL.