As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALERTED ACMS ALERT: RIGHT PACK HEAT EXCHANGER DEGRADED. CLEANING WITH JUST AIR HAS PROVEN TO BE MUCH LESS EFFECTIVE OR NOT EFFECTIVE AT ALL. YOU CAN USE AIR TO BLOW OUT ANY VISIBLE DEBRIS BUT ALSO FOLLOW AMM 21-51-03-160-803 TO PERFORM HEAT EXCHANGER, CLEAN OUT USING SOAP-WATER-AIR. COMPLIED WITH AMM 21-51-03-160-803, SOAP AND WATER CLEANING OF HEAT EXHANGER. RAN PACKS DURING TAXI, NO ODORS OR DEFECTS NOTED.