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Steve the 4th image looks a lot like a stress fracture. They use magnetic paint and some system to identify them but if it's possible it may be worth taking it to an engineering shop for an inspection (they spray some type of paint on which reveals cracks somehow, I only got to play with it once when studying welding too many years ago) or to a dealers who should know. If it is a fracture I'd suggest it should be possible to have it ground and TIG welded I should imagine, it looks like a cast alloy.
I knew someone in Lithgow who would have been able to do it but he's recently closed up shop and Lithgow Valley Engineering also closed down. I have nowhere to go myself. I'm going to have to learn how to TIG weld alloy again soon, I have the 200 Amp AC/DC TIG welder (and 200 Amp MIG) and gas and filler rods butover 20 years of not doing it and, poor eyesight doesn't help.
In saying that I wouldn't be learning on anyone else's equipment but I will get it out soon and do some mild steel and stainless before progressing to alloy again.
Good luck!
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