Best Practice to replace a serialized member in a serialized inventory item

We create a sell serialized assemblies.  The assemblies we sell have a serialized assembly member.  Two serial numbers;
[LIST]
[*]Product
[*]Serialized member inside product[/LIST]Occasionally we have a product that is sent in for service and we need to replace the serialized member component inside.  We've been doing this different ways but recently I was thinking of the "correct" way to handle this and here is what I came up with:

[LIST]
[*]Customer sends in (possibly) defective product
[*]If the serialized member item needs to be replaced we:[LIST]
[*]Create a RMA for the product (internally, the customer doesn't know about it)