What was found
BLEED AIR DUCT PRESSURE DURING CLIMB L63 R37USING TAI BELOW 10K FT L60 R40CLIMBING THROUGH FL300 L58 R38STABILIZED AT CRUISE FL350 L45 R38. GROUNDED - YES. PERFORMED FIM 36-10 TASK 803 UP TO AND INCLUDING STEP F. (2) (D) 2). PRSOV MOVEMENT WAS NOT SMOOTH. PRSOV REPLACEMENT NEXT STEP. ALTERNATE DEACTIVATION PROC USED PER CH 5 TABLE 3 ITEM 7. ALT DEACTIVATION PROCEDUURES REVERSED. 78655 10/23/2023. #1 ENGINE 78655 10/23/23. REMOVED AND REPLACED #1 ENIGINE PRSOV PER MM 36-11-04, LEAKS CHECK GOOD. ALTERNATE DEACTIVATION PROCEDURES USED PER CH. 5 TABLE 3 ITEM 7. ALT. DEACTIVATION PROCEDURES REVERSED. 65537 10/23/2023. REMOVED BLEED AIR REGULATOR REF AMM TASK 36-11-03-000-801. 86722 10/24/2023 INSTALLED BLEED AIR REGULATOR REF AMM TASK 36-11-03-400-801 86722 10/24/2023 PERFORMED ENG RUN REF AMM 71-00-00. NO HELP PROBLEM REMAINS. 13848 10/24/2023. REMOVED BORROWED BLEED AIR REGULATOR PART AND REINSTALLED ORIGINAL BLEED AIR REGULATOR REF MM 36-11-03-400-801. 04274 10/24/2023. A/C P/N TRANSACTION #2 WAS BORROWED PART INSTALLED. REF A/C P/N TRANSACTION #3 FOR LOANED PART REMOVAL AND ORIGINAL PART INSTALLED. CONTINUED ON LP # 60738128. REF GPM 05-00-11.