If the mower deck is made by JD then it may be due to their production line procedure.
Apparently, in a cost saving move, JD manufactures many of its products on a rotating assembly line schedule.
For example, I had ordered a power beyond kit, and was told that it would take 3 days to be delivered from the plant in Atlanta.
Five days later I called the dealer, only to find out that the kit was "on freeze, at the plant in Atlanta," meaning that they were not manufacturing this product at that particular time.
I was told that it could take up to two weeks for them to start production again.
As much as I love my JD - I am equally frustrated over this cost saving policy.
In addition, it is the start of the season, and mower decks are in hot demand.