I changed the accumulators on a 300 TE 4Matic about a year ago because the ride was very stiff. About two months ago, I noticed that I was losing hydraulic fluid. I made sure that I never went low on hydraulic fluid. Now, my 4Matic light stays on. When I had the car checked out, I was adviced that this may be related to the transmission... I am at a lost . Please advise.