replacement for cracked turbo housing

[B2C2]

I had to leave my T337D on the east coast. Discovered overheated paint on the rear fuselage on landing at KSBY and investigation showed cracks in the turbine side housing in the area facing the burnt paint so its leaking exhaust gas and burning the paint. The turbine seems to spin fine and no other apparent damage. The turbo was just rebuilt last year at annual, and it was making good pressure on the flight to the east coast so I think its fine other than the cracks. I manage the TIT religiously at or below 1600F so I don't think it was overheated. Not sure why it is cracked other than age. I have calls into main turbo in visalia CA and Commodore aerospace, no calls back yet but wondering if there is anyone else I should call who might have one on the shelf for a swap?