As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#1 FUEL QTY GAUGE & TOTAL FUEL QTY GAUGES DISAPPEAR AND REAPPEAR. GROUNDED - YES. PERFORMED FQIS BITE TEST REF B737-800 FIM 28-41 TASK 801 & TASK 808. NO DEFECTS FOUND ON SELF TEST. AS PRECAUTION, PERFORMED BITE TEST FOR DEU'S 1 & 2 REF FIM 31-62 TASK 802. NO FAULTS FOUND.