A friend of mine just found that in one of his IPS the oil looks like in the video below.
The boat has only been used for a couple of hours after grabbing a line with the props (which is probably the culprit), and since then she didn't move anymore for the last two weeks.

Not good news obviously, but this chap was expecting to start his well deserved holidays right now, hence the sixty-four thousand dollar question:
How risky would it be for the transmission to keep using the boat for this month, before hauling her out for prop shaft seals replacement (as I suppose will be necessary)?

IPS 500 of 2010 vintage, if that matters.
Thanks in advance!