My 2009 GL550 was in the dealership for replacement of a power control head of

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the power steering. I drove it two days and the power steering went out completely. The dealership now says it needs a new power steering rack. Was the first problem diagnosed incorrectly? Could the technician have made an error with the install? About $1700 for the first problem, new problem $2100. Boy, I hope that is including labor!