As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 (R) SIDE WINDOW HEAT OVERHEAT COMPLIED WITH QRH LIGHT RETURNING. GROUNDED - YES. PERFORMED B737-9 IFIM TASK 30-41-00-810-831. PER INITIAL EVALUATION SEC. B, PERFORMED WINDSHIELD/WINDOW HEAT SYSTEM OPERATIONAL TEST REF B737-9 AMM TASK 30-41-00-710801. CYCLED WINDOW HEAT SWITCH TEST NUMEROUS TIMES WITH NO DEFECTS NOTED. ALL OPERATIONAL CHECKS SATISFACTORY. UNABLE TO DUPLICATE FAULT.