As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RT DUCT PRESSURE DROPS FROM 35 PSI TO 15 PSI SERVER AT TIMES IN FLIGHT. FOUND LOOSE SENSE AIR LINE ON BLEED AIR REGULATOR. TIGHTENED LINE. PERFORMED FIM 36-10-00 810-807 OPS CHECK NORMAL. RAN ENG AT 80 PERCENT FOR 5 MINUTES, NO FLUCTUATIONS. (K)