Hi, thanks for using healthcare magic
If the accident was in 2009,it is unlikely that the leakage he is now experiencing is related. It is not likely to be leakage of fluid from his brain.
should have healed in this time period.
It is possible that he has an ear infection
, he may want to first consult his general practitioner.
If he wishes, he can go to an ear, nose and throat specialist for a review.
Hope this helps