Whining when accelerating

I have a 2007 odyssey lx with 40k miles. I recently visited the dealer for an oil change and they also repaired a power steering pump as part of a recall. A transmission software update may also have been done. Since then I notice that the van whines when I accelerate. This whining diminishes after driving for about 20 minutes but can still be heard slightly. I never noticed this kind of noise beforehand. Is this a problem? Thanks for your great service.