What kind of "serious issues" did Mercedes power unit have before 2020?

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thelostwidow
thelostwidow
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Joined: Tue Jan 12, 2021 11:17 pm

What kind of "serious issues" did Mercedes power unit have before 2020?

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Hi everyone I just read an article [/https://formula1news.co.uk/covid-19-all ... -problems/] in which mercedes say their engine had serious issues before 2021 and the pandemic gave them time to fix it.

do you have any idea what kind of issues they are taking about? and what type of power unit problems could be fixed in such a short space of time?