As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK MODE R RIGHT PACK AIR CYCLE MACHINE HAS FAILED, OR RIGHT ECONOMY COOLING VALVE FAILED OPEN, OR BOTH RIGHT CONDENSOR INLET TEMP SENSORS FAILED. RIGHT PACK IS OPERATING IN A NON-NORMAL MODE (HEAT EXCHANGER ONLY COOLING MODE). ADVISORY -COMPLIED W MEL 2151S. MSG IS COND SENSOR TEMP RT MSG# 21-23402. REPLACED LOW LIMIT VALVE PER MM, OPS CHECK NORMAL.