Dispensation
My company does give rare dispensations when requested by the captain only and not from the ground engineer.
Flight Tech Ops department and Engineering would both evaluate the system and first see if the master DDG has better relief than the company DDG which may be more stricter.
The dispensation if granted will be for that crew to fly a single sector only.
Another example has been a test required by the DDG that didn't work to prove the system functionability. Engineering has come up with an alternative test procedure that adequately confirms a safe and operational system.
The dispensation would then be issued and in this case a supporting engineering maintenance concession to list a procedure for the ground engineer to carry out the alternate test.
TW