- Model with the serial number starting 011839 or higher, should be fixed .
- Model with the serial number starting 011838 or lower, may have the problem .
- The manufacturing problem leading to the noise apparently took place BEFORE that date code.
To break down the serial number method:
- 01 18 39 (spaces added for clarity)
- 01 (not sure on this value),
- 18 (I am guessing 18 meaning 2018 for the year ),
- 39 (the 39th week of the year)
- remaining numbers are most likely the actual “serialization” that tracks each individual unit.