model sr-l628ev. fridge warms up and leaks?

i have had my fridge freezer for 6-7 years now. its been great until the last few months. the freezers fine, but he fridge keeps so warm its pointless being there. everynow and again it will get cold, but then throws water all over the shelf and stops again. any ideas on what i can do to fix this? lack of funds means no engineer, extended well run out, and no money to buy a new one. if i had a clue about what it could be i could mayb get if fixed? up until now it has been fantastic.