Hello, I'm having an issue with transmission fluid coming out of the ventilation tube near the firewall in my 05 Blazer. I've reviewed threads on this forum and it appears the fix is to replace the vacuum switch and the transfer case input seal. Is there any point in trying just the vacuum switch alone as I can do that myself, or should I tap out and bring it to a shop to do both at the same time? Thanks in advance for any help.