We have a Maytag Neptune Washer, Model MAH3000AWW. We began noticing what looks like oil (black liquid) in a puddle under the left rear of the washer. I took off the back panel and it's all over the inside back and what looks like a shock absorber. There is another one on the right rear that is clean. Is it an oil filled shock absorber? How difficult is it to replace? If not that, any other ideas on what is wrong?