Need help! 2nd opinion on oil pump issue

My "oil pressure" light came on in my 04 Audi A4 after getting the fuel pump replaced. There is currently a recall for a sludge build up issue but the technician at the dealer is saying that they don't see any sludge build up. They're saying it could be an issue with a tube in the oil pan gasket. They found a leak in the oil pan gasket and are saying that should be repaired ($850) and that while they're down there that they'll take a look at the tube to see if there's an issue. Does this sound reasonable? Any similar known symptoms? Any ideas as to what might be the issue? Thanks!