My 147,000 mile 2001 3.3L Grand Voyager illuminated its check engine light yesterday. The DTC codes stored are P1784 and P0700. I checked the fluid level when I got home with engine idling and transmission in park. The fluid level on the dipstick was low for the hot scale so I topped it up. Earlier in the day it was noticeably clunky shifting into and out of reverse. I put the battery on charge and was surprised to see that my Accumate charger thought it was quite flat. I guess it's had a lot of short journeys recently. I have found a transmission fluid leak on side cover. The transmission is about due for its next filter and fluid change so I am going to drop the pan, change the filter, fit a new solenoid pack and new speed sensors. How much ATF+4 do I need to refill the transmission? I realise that some old fluid will still be left in the torque converter. Where can I buy ATF+4 in the UK at a nice price? I used Morris Multitrans MPC yesterday as I was out of ATF+4. What other ATF+4 compatible fluids are there in the UK?