As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
VERTICAL SPEED UP/DOWN WHEEL INOPERATIVE WITH AUTOPILOT "B", FULLY FUNCTIONAL WITH AUTOPILOT "A". GROUNDED - YES. PERFORMED B737-800 FIM 22-11 TASK 801, AUTOPILOT 'B' LAND VERIFY. AUTO, INTERACTIVE AND SURFACE TESTS PASSED. NO FAULT NOTED. NO HISTORY IN 60 DAYS. OPS NORMAL. (DFCS). CLEARED MEL 22-14C.