As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 2172 DURING APPROACH WHEN BRINGING CONDITION LEVERS TO 1050, POWER LEVERS FLIGHT IDLE NR 1 ENGINE SURGED FOR ABOUT 2 SECONDS. WHEN POWER LEVERS WERE ADVANCED AHEAD OF FLIGHT IDLE SURGE STOPPED. UPON INSPECTION FOUND NR 1 POWER LEVER BETA BACKUP SWITCH OUT OF ADJUSTMENT. ADJUSTED SWITCH. NO PARTS REPLACED. OPERATIONAL CHECKS GOOD. AIRCRAFT RETURNED TO SERVICE.