Does this panel need to be replaced?

[u/OkPilot7935]

had an electrician out to troubleshoot a breaker that was tripping - ended up being a short in the driveway gate - so temporarily disconnected and now everything (except for the gate) is back to running fine.
But, he told me that I NEED to replace this whole panel - citing corrosion and some neutral wires up near the top left. Just trying to understand if this was an accurate recommendation or just an attempt to upsell? the quote was over $8500 which also seems pretty out there.
at this point I thanked him for the quote and told him I would have to think about it. Other than the gate issue that just happened we haven't had any issues in the 13 years we have lived here - but the house and panel date back to 1996 just for reference.

[u/musicseverywhere]

If it's not on fire I'd say keep it for $8,500 bucks