[V8] Oil Seals

[roncav3 at comcast.net]

Hi fellas,
Pretty new to the mailing list and I'm hoping that maybe some of you can offer some words of advice.  My question is, can replacing the rear main seal cause other engine oil seals to weaken and leak?

I knew that my rear seal and valve cover gaskets were leaking.  I asked a local garage (that was recommended) to fix the "oil leaks."  Well, I got my car back after having the rear seal replaced (I did the valve cover gaskets) and my car was still leaking oil.  The garage determined that it was now the front seal leaking because replacing the rear seal caused "pressure to crack the front seal."  Is this guy for real?  My problem is, I knew the rear seal and valve cover gaskets were leaking when I brought it in, but didn't think to look for any other leaks beyond that one.

Any thoughts would be greatly appreciated.  Thanks.

Ron