Hi Brett,
Take a sample an of the foamed lube and stand on bench it should clear in 3-4 mins, if longer check out the new oil tests on antifaomimg and compare to check if the lube is OK but it will be as you have changed it recently.
Once you are satisfied the lubricant is OK, (Should be as new) Then complete a WDA by microscope and check for light adhesive wear as that will check if the amount of foam is compromising the oil film thickness and is most likely is OK as we have drives that just "whip Cream" the lubricant but no wear when checked by microscope WDA. If you are able to complete the above and all OK then the application most does not warrent your time and concern until your monitoring notes any other changes from normal. Adhesive Wear and WDA explained on this link www.rttech.com.au
Regards
Rob S