What was found
ON CLIMB-OUT, CREW NOTICED THE LAVATORY SMOKE CAUTION LIGHT WAS ILLUMINATED. THE FLIGHT ATTENDANT CHECKED AND DID NOT NOTE ANY FIRE OR SMOKE, BUT THE CREW RETURNED BACK TO MSP AND LANDED WITHOUT FURTHER INCIDENT. FOUND ENGINES TO BE BURNING NORMAL AMOUNT OF FUEL. OIL LEVELS OF ENGINES APU, AND PACKS GOOD. INSPECTED COALESCER BAGS FOR EVIDENCE OF OIL OR GLYCOL. NONE NOTED. REMOVED LEFT/RIGHT 10TH STAGE BLEED SHUTOFF VALVE TO INSPECT FOR OIL FILM. NONE DETECTED. REINSTALLED SHUTOFF VALVES. REF AMM 36-11-04. RAN ENGINE AT DIFFERENT POWER SETTINGS, NO HAZE OR OIL SMELL NOTED AT THIS TIME.