As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 8216 RETURN TO GATE AT JNU: ON TAXI OUT AT JNU NR 1 BLEED FAULT LIGHT ILLUMINATED. ON TAXI BACK TO GATE NR 2 ENGINE EEC FAULT LIGHT ILLUMINATED. THE PILOT RETURNED TO GATE. MAINTENANCE REMOVED AND REPLACED THE NR 1 BLEED VALVE AND THE NR 2 MECHANICAL FUEL CONTROL. POWER ASSURANCE RUN PERFORMED. AIRCRAFT RETURNED TO SERVICE.