I have a P.A. ProComp C4 with a reverse manual valve body. Just got the c4 back from P.A. 3 weeks ago. Ran great until today. On the way home it did not want to shift into 3rd. Then when I got home I realized There was no reverse at all. The transmission is warrantied for life but I don't have another $300 for shipping much less the 6 weeks turn around time. Any thoughts where I need to look first? Valve body or deeper? Thanks for your help!