As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RIGHT FWD WINDOW HEAT OVERHEAT ANNUNCIATOR LIGHT ON AFTER TAXIING. GROUNDED - YES. PERFORMED OPS TEST OF WINDOW HEAT SYSTEM IAW B737-9 AMM 30-41-00-710-801 R1 WINDOW WOULD NOT TEST. PERFORMED BITE TEST OF WHCUS. NO LIGHTS ON R1 WINDOW SIDE. FOUND C/B B8 P6-5 POPPED. RESET C/B D8 AND RE-PERFORMED OPS CHECK AND BITE TEST. ALL CHECKS GOOD. WINDOW HEATS NORMALLY.