OT Ally casing repair - Cayenne

[Sharkmaster]

Hi All,
I started doing a major refresh to a certain CTT last year & cocked up
badly removing a bushing from the front diff casing. My press tool slipped
& expanded the bushing, cracking the casing, luckily on the outside "loop"
that the bushing mounts in. I had a local guy vee it & weld it which looked
really good, but the crack opened up with very little pressure when I
started installing the new bush. Can anyone recommend a specialist that
might be capable of repairing this reliably.

Link to the photo before the incident. The crack is invisible anyway but
runs front to back in line with the bush.
https://photos.app.goo.gl/sGvS3wQYTAPJwYUT6

Many thanks,
Mark N