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Probably heat. It's not common for them to fail so nobody has gone to the effort of try to upgrade the module. You say you took it to Holden, was the second one brand new?
Cant Can em new anymore was second hand from a wreckers
Check your error codes, otherwise you (and probably Holden) are only guessing. It's very simple, just follow the link below:
https://forums.justcommodores.com.au/threads/abs-error-codes.56087/