As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT, AROUND 20,000 FT, THE NR1 ENG PWR CHANGED FROM MCL TO MCR BY ITSELF. DEPRESSING MCL SELECTOR RESET NORMAL MCL POWER. NO UNUSUAL ENGINE INDICATIONS NOTED. PERFORMED OPS TEST OF THE ENGINE CONTROL PANEL (INCLUDES THE MCL AND MCR SWITCHES) IAW TASK 76-10-11-710-801. OP TEST GOOD. NO DEFECTS NOTED. COUND NOT DUPLICATE, RETURNED TO SERVICE. NO PARTS REPLACED.