Engine Prying or Coincidence
I agree during alignment they may have used a pry bar and damaged the oil pan or oil filter. I know I recently aligned my engine and had to be careful to not pry on anything that could be damaged.However, it might also have been coincidence, so I'd suggest without cleaning it up, first try and discover where the oil is coming from, and what type of oil it is (tranny oil often is automatic transmission oil and is lighter and has a color -- red/pink, versus engine oil is dark/near black).Then, armed with knowledge, approach marina manager, this way you can't be 'snowed'.Good luck... Hope this helps...