As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT ENG DUCT PRESSURE FLUCTUATES. FLUCTUATES BETWEEN 20-40 PSI ALSO VARIES W PACK OFF. PER FLIGHT CREW FLUCTUATION AT CRUISE AND DESCENT RIGHT DUCT PRESS NEVER EXCEEDED LEFT SIDE, RIGHT OFF LIGHT ON AND OFF ON DESCENT. ENGINE WAS REPLACED. ACCOMPLISHED PNEUMATIC SYSTEM TEST PER JRH. ALL BLEED PARAMETERS NORMAL, NO FLUCTUATIONS NOTED.