As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON RECALL AFTER START, ORANGE "FLT CONT" ON SIX PACK AND "MACH TRIM FAIL" ON OVHD PANEL ILLUMINATED. RESET EXTINGUISHED ALL LIGHTS. GROUNDED - YES. FOUND C/B A SYST OPEN, PERFORMED GVI OF C/B - RESET C/B PER B737-900 AMM 20-60-01. PERF DFCS BITE CK.