My transaxle ssems to have an issue. Perhaps someone can help. It will not go up hills or inclines nor will it it want to climb from a parked position on an incline. If it sit for a couple of hours its fine for a couple of tries then doesn't want to go up. It is fine on Flat surface roads/freeways and is fine in reverse on flat or inclined roadways. Fluid level is fine and clean. I had the system flushed in May, two bolts on the pan were recently loose, causing a leak and were re-tightend. Any ideas?