As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: AT FL400 RIGHT FUEL REMAINING STARTED DROPPING FROM 7.0 REMAINING TO ABOUT 4.0 REMOVED AND REPLACED NUMBER 2 MAIN TANK FUEL COMPENSATOR PROBE. PER 28-41-21-401. PERFORMED B737 AMM 28-41-00-730-801 AND 28-41-21-710-801 DRY CAP AND RESISTANCE CAPACITY CHECK AND BITE CHECK GOOD.