As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) OPS CHECK OF WING DEICE STANDBY THERMAL SWITCHES WAS CALLED UP DURING A SCHEDULED "C" CHECK INSP. MOST OF THERMAL SWITCHES FAILED THE OPS CHECK. NEW SWITCHES WERE DRAWN FROM STOCK AND RETESTED PRIOR TO INSTALLATION. MOST OF THESE NEW SWITCHES TESTED WERE REGISTERING AROUND 200 DEGREES CELCIUS. CORRECT PARAMETERS SHOULD BE 218+- 8 DEGREES CELCIUS. BATCH NR ON PO`S WERE 1501528 AND 1501226.