Presumably, the aircraft that have been grounded with cracked pickleforks are having their pickleforks replaced.
Once a number of cracked pickleforks have been removed, metallurgical examination of the damage and cracking should identify the failure mode(s) and thus ultimately allow a long term fix.
Is anyone privy to any of the investigations or examinations of the actual damaged pickleforks to date and if the failure mode(s) have yet been identified?