As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 6765022) CAPT L2 WINDOW BEGAN ARCHING IN FLIGHT AT FL360. ARC NEAR MID-RIGHT SIDE OF WINDOW. IMMEDIATLY RAN QRH AND REMOVED POWER TO WINDOW. REMOVED AND REPLACED WINDOW HEAT CONTROL UNIT M322 PER B737 AMM 30-41 297056 R&R L2 WINDOW OPS CHKS AND RIGGING REQD PER B737 AMM 56-12. COMPLETED INSTALL OF L2 WINDOW IAW AMM 56-12 . LEAK CHK GOOD.