What was found
ON CLIMB OUT DUCT PRESSURE SPLIT RIGHT PRESSURE FLUCTUATED 40-45 PSI, LEFT PRESSURE PEGGED @ 80 PSI. ON CLIMB PHYSIOLOGICAL SENSING IN EARS WITH A PULSING SENSATION. GROUNDED - YES. DIVERSION TIME 38 MINUTES - ACCOMPLISHED NO. 1 ENG BLEED AIR SYSTEM HEALTH CHECK UTILIZING 737 PNEUMATIC KIT. WHILE ACCOMPLISHING HEALTH CHECK FOUND CONTROL PRESSURE SENSE LINE FROM THE HIGH STAGE REGULATOR TO BE DAMAGED. R/R TUBE ASSY P/N 332A2350-11. ACCOMPLISHED #1 ENG BLEED AIR CROSSOVER TEST REF AMM 36-11-00-710-801 & TEST FAILED. DUCT PRESSURE IS STILL PEGGED OUT AT 80 PSI WITH ENG AT 80% N1. FOUND #1 ENG PRSOV MISSING A PLUG ON THE D/S SIDE OF PRSOV. INSTALL NEW PLUG REF MM 36-11-04-400-801. TEST PASSED.