As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LEFT FWD CAPT WINDOW HEAT FAILED WHICH CAUSED THE WINDSHIELD TO CRACK. GROUNDED - YES. DIVERSION TIME 41 MINUTES - R/R CAPT WINDOW IAW B737-900 AMM 56-11-11, R/R WINDOW CONTROL UNIT LEFT IAW AMM 30-41-00,PERFORMED OPS TEST OF WINDOW HEAT SYSTEM, OPS TEST OK IAW AMM 30-41-00-710-801, A/C OK FOR SVC.