As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT BLEED PRESSURE OSCILLATES DURING CLIMB THRU 10000 FT, 15-50 PSI RANGE. STOPS AT 10000 FT BUT REMAINS LOUDER THAN RIGHT BLEED. NO BLEED SPLIT AT 410. PACK OPS NORMAL. NO EICAS STATUS. COMPLIED WITH FIM 36-10-01, FAULT TREE 803. INSPECTED BOX AND FOUND LEFT HIGH PRESSURE CONTROLLER FAULTED. INSPECTED VALVE AND FOUND A LOOSE LINE, TIGHTENED THE LINE AND PERFORMED A BITE. NO FAULTS INDICATED IAW FIM 36-10-01.