As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACK 2 VLV CLSD DURING CLIMB BELOW 10,000 FT. WE RESET IT & IT CAME BACK ON AT 220 FL, IT WAS RESET 6 TIMES DURING DESCENT. DEFERRED IAW MEL 21-29. REMOVED AND REPLACED NR 2 DUAL HEAT EXCHANGER IAW EMB 140 AMM 21-51-02 AND OPS CHECKED GOOD. MEL ITEM 21-29 RESTORED AND CLEARED.