What was found
ON DECENT AND LANDING RED BAG FIRE LIGHT ILLUMINATED. TOWARDS REAR OF AFT CABIN, THERE IS AN ODOR OF WHAT MAY BE ELECTRICAL. WE SHUTDOWN THE ACFT POWER AND PULLED ALL CIRCUIT BREAKERS FOR AFT LAV. EVERYTHING UNDER THE LAV SINK WAS SOAKING WET. T/S SYSTEM REMOVED SHORTED LAV WATER SWITCH (P/N -SP-833 S/N -011500120) AND INSTALLED NEW SWITCH (S/N -91500019) IAW AMM 20-10-50-201. OPS CHECKS OK. REMOVED TIMER ASSY (P/N-KSPSN21B) AND INSTALLED NEW TIMER ASSY, (P/N -KSPSN21B) NSN IAW HS-800XP AMM 20-10-50-201. OPS CHECKS OK.