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Have you read of Akatsuki, JAXA's Venus orbiter? It suffered a grievous propulsion failure in 2010 when a pressurant valve failed, causing its large main engine to run oxidizer-rich -- its nozzle thus shattered and fell off. It was therefore unable to enter Venus orbit in 2010.

However, JAXA engineers saved the spacecraft and salvaged the mission: after five years of orbiting the sun (beyond its expected lifetime), Akatsuki's far smaller attitude-control thrusters were lit up (for 20 minutes straight!), causing it to successfully enter Venusian orbit in 2015, and it's been functioning ever since.




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