[Elecraft] [K1] New (to me) K1 questions

[Hank/KE0CU]

I recently purchased a good used K1 and have a couple questions:

1. Based on the serial number and/or original purchase date, is there anyway
to determine whether hardware or firmware upgrades/modifications are
available?

2. I am interested in back lighting the display. Does anyone offer a
modification kit for this purpose?

Thanks!

Hank/KE0CU

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