What was found
(CAN) WHILE ON THE GROUND THE F/O SLIDING WINDOW OVERHEAT LIGHT ILLUMINATED. THE WINDOW HEAT CONTROLLER FAILED THE FUNCTION TEST AND THEREFORE WAS REPLACED WITH A SERVICEABLE UNIT. WHILE THE TECH WAS COMPLETING THE LOGBOOK PAPERWORK THE F/O NR 2 WINDOW SHATTERED. THE WINDOW HEAT CONTROLLER WAS REPLACED AGAIN ALONG WITH THE F/O NR 2 WINDOW. SYSTEM TESTED SERVICEABLE IAW 30-41-11. WINDOW ASSY: 641A4810-5, SN: 2768113, TSN 36625: AND WINDOW PANE, PN: 5-89355-78, SN: 09049R1486. GLASS TSO 12154 WINDOW HEAT CONTROLLER, PN:83000-05604, SN: 6719.