As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWICE, A LOWER ALTITUDE WAS SELECTED AND ACFT FAILED TO DESCEND, OVER RODE WITH VERTICAL SPEED. COULD NOT CONFIRM ANY FAULTS LAST FLIGHT. NO PREVIOUS HISTORY PAST 30 DAYS. PERFORMED MCDP GROUND TESTS 30 & 40 IAW MM 22-00-02-2. NO DISCREPANCIES NOTED. OK FOR SERVICE. PERFORMED MCDP GROUND TESTS 30 & 40 IAW MM 22-00-02-2.