does it make sense to do a sleeve and valve replacement in the valve body. on 1997 Chevrolet 1500 Pickup

the reason i ask this i was on here a few days ago and a trans guy was telling somebody with the same problems i am have 1870 code...that loc-up port in the valve body can be fixed to help with a hard shift problem. I have a 1997 4x4 1500 5.7 Chevy truck and i recently made an appt. to get just that done.the trans guy knew exactly what i was talking about, got a price and all good to i though till i read this...and this is a quote...""The 1870 code usually means bad transmission or valve body, probably better off just replacing transmission."" Now that being said i am really confused now. Can any body shed some light for me, my appt. is on tue.23rd so the sooner the better. Thanks Brad

Asked by for the 1997 Chevrolet 1500 Pickup