As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 296 - CREW ADVISED VIA ACARS WERE ENCOUNTERING PROBLEMS WITH THE DUCT PRESSURES. AT CLIMB POWER, THE LEFT DUCT PRESSURE READS 80 PSI WHILE THE RIGHT READS 38 PSI. THE DECISIION WAS MADE TO DIVERT TO PIT. NO EMERGENCY WAS DECLARED AND THE FLIGHT LANDED WITHOUT FURHTER INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENGINE 13TH STAGE MODULATING AND SHUTOFF VALVE. OPERATIONAL CHECKS NORMAL PER MM. (M)