My RR MkIII now has 102,000 miles and recently had both front air struts replaced at RR dealership. I drew attention to "Trans. Failure Prog" code that appeared around 80,000 miles (they checked this out then but could not find the reason for message) though the truck has driven flawlessly until the above suspension issue. Prior to the suspension repair the dealer told me a new battery is required since my old one had a dead cell. I reluctantly agreed to a new replacement. I collected my repaired RR with "Trans. Failure Prog" error untouched and expecting the vehicle to drive in exactly the same manner except for a smoother ride. No chance! In drive, the transmission shifts up to 4th but does not engage 5th, Sport mode does not exist at all anymore though the dealer tells me "Trans. Failure Prog" renders Sport mode redundant though it was functioning OK prior to battery change! The dealer checked for error codes etc but found none and is unconvinced the transmission sticks in 4th. I reported 70 mph = 3000rpm and he says this is normal. Can someone confirm this please? If I'm correct in assuming 5th gear is not engaging does this point to a failing transmission?