LG WS2011XM Owner's Manual page 49

Serial Number
How to read Serial Number.
There is attached a Serial Number label on back side of this product.
8 0 5 K W
Example)
Critical Parts List
When you need to change frequency of washing machine (60Hz → 50Hz),
You must change following parts list.
* DRAIN PUMP ASSY.
* *
0 0 0 0 1
Serial No.
Product code
Manufactured Month.
Manufactured Year(Last digital).