To repair the vent in a septic line, the vent was broken in a snow storm last winter now the ordor in bad

to repair the vent in a septic line, the vent was broken in a snow storm last winter now the ordor in bad

Ac picture would help a lot. Where was the vent broken, Here are some septic tank vents,(see image) does yours look like the ones pictured?
Back to you, Tom