What was found
AFTER FLYING LEVEL AT 6000 MSL, WE INITIATED A CLIMB. WHEN CLIMB THRUST WAS SET THE RIGHT DUCT PRESSURE BEGAN SURGING BETWEEN 15-40 PSI APPROX ONCE PER SECOND. THE CONDITION PERSISTED UNTIL REACHING APROX 16000 MSL. AT THIS POINT THE CABIN DIFFERENTIAL PRESSURE WAS 6 PSI. BOTH LEFT AND RIGHT DUCT PRESSURE STABILIZED AT 36 PSI. REPEAT WRITE UP. REF LOG PAGE # 1435214 AND # 1461261.(<P>INSPECTION OF HPSOV IN R/H ENGINE PYLON IAW AMM 36-11-07. ALL FITTINGS & PLUGS ARE SECURE. NO DAMAGE OR LEAKS NOTED. C/W BITE TEST OF PRSOV IAW FIM 36-20 FT 804. NO FAULTS DETECTED. SYSTEM OP CHECK NORMAL.</P>)