Alstom didn't want to make the Citadis Spirit. They advised against it, but Ottawa City Council wouldn't listen and insisted on a train that was low to the ground while operating as a Metro. Alstom warned them that no such train had ever been built before.
This is probably why Alstom is less than enthusiastic about trying to fix the bogie/ axel issue because they warned Ottawa that this train wouldn't work.
The problem with Line 1/ Confederation line in Ottawa is that it's using the wrong rolling stock. There's no reason why the line shouldn't have the same trains as the REM in Montreal.
en.wikipedia.org
en.wikipedia.org