As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ENGINE PRESSURE RATIO FLUCTUATED AT LEAST 0.41 (FROM 1.40 TO 0.99) TWICE AS AIRCRAFT LEVELED OFF FROM CLIMB. ENGINE PRESSURE RATIO, FUEL FLOW AND RPM MOVE TOGETHER. AFTER REDUCING ALTITUDE AND CLOSING NUMBER 2 ENGINE BLEED, FLUCTUATION STOPPED AND REST OF FLIGHT UNEVENTFUL.