As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT PACK INOP EICAS MESSAGE DISPLAYED.(<P>TRANSFER TO MDDR # 112784 IAW DDG 21-51-01-01 CAT C.</P><P>LOG PAGE 1050947 ITEM M5: REVERSED DDG. T/S PER AMM 21-51-14. LH PACK TEMP CONTROLLER. RAN PACK FOR 2 HRS, CYCLED SWITCH NUMEROUS TIMES DURING OPERATION. ALSO RAN ENGINES TO TRY AND DUPLICATE FAULT. NO FAULTS OR MSGS NOTED. OPS CK GOOD. THIS CLEARS DMI 112784.</P>)