The M.E.L. gives the right to an AME to refuse to release an aircraft for service or a Pilot to refuse the Aircraft if it is considered unsave to do so even though the defect can be carried forward under M.E.L.
The problem here is was the snag unsafe.
Gear extend ferry is not abnormal.
I wonder what was the exact cause of the LG malfunction though.
regds
MEL.