Thank you for your support.
I followed your instructions, and Adafruit
already shipped the replacement jumpers.
Too bad I could not combine the RMA return with a new order as:
1) It would have reduced my shipping fees on my new order.
2) Adafruit would have used the material of only one parcel instead of
Paid by Adafruit:
United States Postal Service (0.17lbs)
(First-Class Package International Service incl. $1.60 insurance):