What was found
AUTO FAIL CAUTION LIGHT ON AT CRUISE ALTITUDE 35,000, WHEN SELECTING 37,000. SYS AUTO SWITCHED TO ALTERNATE. RAN QRH CHECKLIST 2.2 CONTINUED IN ALTERNATE MODE IAW CHECKLIST. NR 2 CONT BITE SHOWED EXISTING FAULT OFV LRU FAIL IAW FIM TASK 21-31, TASK 827. SUBSEQUENT BITE SHOWED NO FAULTS AFTER RESET. BOTH CONT 1 AND 2 PASS, NO FAULTS. REF FIM TASK 21-31 TASK 802, OK FOR SERVICE.