As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: ON CLIMBOUT RIGHT DUCT PRESSURE FLUCTUATIONS FOLLOWED BY LEFT PACK ILLUMINATION. PACK LIGHT INITIALLY CLEARED WITH TRIP RESET BUT RETURNED WITHIN 1 MINUTE. **SUPPLEMENTAL INFORMATION: ACCOMPLISHED TSM IAW JOB CARD 36-95-01 AND LEFT ENGINE BLEED REGULATOR CHANGED.