@Glomen

The D1281060A.JCV was delivered in the RMU 006-D0323-12 EU 2011_20 for nüvi 37xx and was later replaced there by D2504010A.JCV.

Details about errors came from another forum. I can't confirm if that's correct or not.
It might be that Garmin first delivered D1281060A.JCV for nüvi 37xx and just made a later enhanced D2504010A.JCV version just for the nüvi 37xx series.