As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IAS/MACH SPEED FROZE. THE KNOB TURNED BUT SPEED DID NOT MOVE. GROUNDED - YES. DFCS BITE TEST SHOWS "FMC DATA INVALID" LAST FLIGHT LEG ON CHANNEL A AND B, REF FIM 22-11 TASK 801. PERFORMED BITE CHECK OF FMC SYSTEM, NO FAULTS FOUND. MCP TESTS NML, REF FIM 22-11 TASK 803. NO HISTORY LAST 30 DAYS. GROUND VERIFICATION TESTS PASSED.