As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT NR 3301 - ON CLIMB-OUT FROM DTW, THE LEFT FUEL QUANTITY GAUGE DROPPED TO 300 LBS. THE RIGHT GAUGE THEN DROPPED FROM 800 LBS TO 600 LBS. THE AIRCRAFT RETURNED TO DTW. MAINTENANCE WAS UNABLE TO DUPLICATE THE DISCREPANCY. THE GAUGE WAS REPLACED AS A PRECAUTION. THE SYSTEM OPERATED SATISFACTORILY. (M)