As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PACKS FLUCTUATING WITH APU AIR.(<P>TRANSFER TO MDDR 154006 IAW MEL 36-11-04, CAT C.</P> / <P>LP 1386698: PERFORMED ENGINE RUN AND ENGAGED ENGINE ANTI-ICE SYSTEM PRESS NORMAL, NO FLUCTUATIONS OF PNEUMATIC AT NORMAL BLEED INDICATION. IAW AMM 72-00-00 AND FIM 36-10 FAULT 642.THIS CLEARS MDDR# 154006. REVERSED DDG.</P>)