Frame And Members problems of the 1996 Nissan Sentra

K-frame or a-frame or engine cradle has been corroding. My mechanic tells me that it can break-off and cause loss of control. The corrosion was seen early but Nissan dealer I was servicing my vehicle never told me about that. When I took my car to other mechanic he informed me of the problem and told me that he sees this on other Nissan Sentras. Contacted the manufacturer and dealer but they refuse to correct the problem.