As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WINDOW OVERHEAT RT SIDE ILLUMINATED IN CRUISE. FOLLOWED QRH, WHEN SWITCHED BACK ON OVERHEAT LIGHT DID NOT ILLUMINATE. ACFT GROUNDED. WHCU SHOWS FOR LAST FLT & WINDOW POWER FOR PREVIOUS 2 LEGS. RESISTANCE CHECK OF SENSORS SHOWS WITH IN LIMITS EVEN COMPARED TO SPARE. RESISTANCE CHECK OF HEAT FILM SHOWS 59 OHM FOR WINDOW CODE H15, TERMINAL BOARD TAP WAS AT POSITION 2. LOCATED TAP TO POSITION 1, TB5014, REF MM 30-41-21 & WDM 30-41-11. OPS CHECKED WINDOW HEAT NORMAL.