Just had my steering box rebuilt on my 87 euro 16v. The shop that I bring it to replaced the seals last Oct and it held for 9 months or so then blew the seal out again. They tried to replace them but it did not work. He said the best hope was to yank it and rebuild it. He said over time that the insides can get scored and what have you and that the presure will build up and blow the seal out. They did not charge me for the R&R since they already did that back in Oct. They just charged me for the rebuild which was $700. I guess I should be happy they were able to rebuild it. A new steerig box for my car is over $1800.
Car runs great now.