As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RECEIVED A RIGHT FMC FOR 1 MINUTES THEN SYSTEM SELF-CORRECTED TO NORMAL DUAL FMC OPS, NO CORRECTIVE ACTION WAS TAKEN. GROUNDED - YES. REF B737-900 FIM 34-61 TASK 837. NO CURRENT FAULTS ON FMC, HISTORY SHOWS INTERMITTENT FAULTS ON LEGS 2, 39. NO HARDWARE FAULTS DETECTED. FMC TRANSFER SWITCH RETURNED TO NORMAL POSITION.