house septic help!

i think im going to dig it up and see ......its more work on me but then i will know for sure instead of guessing........my uncle will pay for it bcoz he is the actual owner of the house but he depends on me to keep up the house....thats why i live here rent-free .........so if i can save him a heap of dough....that makes it worth it......i hadnt even thought of digging it up there and looking.

the lid is dug up right now bcoz i had it pumped two weeks ago ........and in just two weeks the tank is full of water.........the other day it snowed and after the snow melted the tank overfilled through the lid.......

plus i want replace the lids with plastic risers .......i hate having to dig everytime i pump it .....plus the great big concrete lid is ridiculous ....it prolly weighs more than me and there is no way i can move that ...so it needs to go...

i understand that even if i dig it up ....there is still a chance that its finished and needs to be replaced ...but to me its worth the work to know for sure for sure........thanks FABO for the input