As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB ABOVE FL240 AP "B" HAD DIFFICULTY HOLDING THE SELECTED AIRSPEED. SEEMS TO OVER COMPENSATE FOR CORRECTIONS. AP "A" SEEMED TO WORK FINE. GROUNDED - YES. ACCOMPLISHED FMC BITE REF B737-900 FIM 34-61 TASK 801. FOUND DFCS TARGET AIRSPEED SSM MESSAGE. ACCOMPLISHED FIM 34-61 TASK 825 & DFCS BITE FIM 22-11 TASK 801. DFCS BITE RETURNS NO FAULTS. ACCOMPLISHED FIM 22-32 TASK 803. TEST RESULTS SATISFACTORY.