As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IN CRUISE, FLIGHT AT 6500 FT, THE NR 2 SERVO CAUTION LIGHT CAME ON. OPENED THE SYNOPTIC PAGE AND FOUND ALL PRESSURE AND TEMPS NORMAL. HOWEVER THE 4 SERVO LIGHTS WERE YELLOW. FOLLOWED THE EMERGENCY PROCEDURES CHECKLIST AND TURNED AROUND. AFTER A FEW MINUTES THE CAUTION LIGHT BEGAN TO GO OFF AND ON AND AFTER A MINUTE OF THAT IT WENT OUT AND STAYED OUT. RETURNED FOR MAINTENANCE TO CHECK THE PROBLEM.