As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT BLEED AIR DUCT PRESSURE FLUCTUATES WILDLY AT TAKEOFF & CLIMB. THRUST NORMAL AT CRUISE POWER. REMOVED AND REPLACED PRSOV. RPL HIGH PRESSURE CONTROLLER (P/N 773289-15 (S/N 133), RPL PRV CONTROLLER (P/N 792755-8 (S/N 166). NO HELP. ACP'D PNEUMATIC HEALTH CHK. FOUND NEWLY INSTALLED PRSOV FAILED THE CK. RPL'D PRSOV. NO LEAKS NOTED, NO FAULTS NOTED. OPS CK NORMAL.