FREDA
I think that the technical side of the Viking recovery is now well underway, the difficult part was always going to be the quality control paperwork aspect with the new contractors who have had to adapt to the heavy and sometimes inflexible airworthiness oversight expectations of those who's previous experience was with much more complicated aircraft of entirely different construction.
The fact that a Viking has had air under its wheels is a major step forward in that those in control of quality assurance and safety oversight have run out of reasons to keep the aircraft on the ground.
Now the "system" has been established I see the aircraft returning to service as quickly as the industry can manage with the resources avalable.