Sorry Gentlemen. After having said so much and I did not provide model of my car!
Mine is a W124 model, automatic transmission, manufactured early 1993, 16 valve engine. I appreciate all replies for the help needed. Thanks.
Hey Uncle Acky. You are right that the tumbler was replaced to correct the problem. The mechanic should have ensured that the problem is corrected. But I don't really trust them to take the next step as the mechanic recommended that the steering and many other things will have to be taken apart and might be replaced. He said it is a long and expensive job. He don't seemed to know what he is doing. I trust our guys in this forum anytime!