https://www.cnbc.com/2020/03/24/boei...urces-say.html
The article also states that their first priority is planes already built. That would be the logical approach because I expect storage space to be at a premium and it will be a big task as it is to apply whatever fixes are approved to planes already built (including those awaiting delivery and those dotted across the world stored).
In any case, I would have thought any fix or production restart would be subject to the required fixes being approved besides the issues with COVID-19.