I realise that fixing an Arcane Connection is a lab activity taking a Season, and shouldn't involve spell casting.
However, I expect that an InVi examination of a fixed arcane connection should show evidence of the sigil of the mage who fixed the arcane connection.
Does anybody know if there anything in canon that would counter this expectation of mine?
However, since sigil appears in magical things, and that arcane connection is not a magical thing by itself (the only magical thing in it is that it allows to use arcane range spell), I'd say: no sigil so you can't know who fixed an arcane connection to you.