I have read all the above Q and A of this same problem I have (cracks/cuts on bottom of liner on folds), which I believe the cuts were made from the Barracuda vacuum getting stuck for a couple of hours a few times over.. So if it is impossible to fix as you say on the Folds, yet the liner is all but 4 years old, and this is the second time this has happen, exactly the same as the first liner when pool was built in 2003, what could be the problem in why this keeps happening?
Also I hired the best pool maintenance company around, owner seemed to be very knowledgeable in all fazes, yet this started to happen (folds) 2 years back regardless, as far as the cuts just recently, noticed drop in water, and 1" a day, very costly in our area..
Now the maintenance man said the reason it had happened the first time was more than likely do to Chemicals not being dispersed evenly throughout the pool, which changes the PH, especially if the chemicals are thrown in that same area and not swept etc. to which I replied that I did not do that, I would always broadcast the chemicals throughout the pool. He also said that the leakage could have been caused by improper liner not being placed correctly, which the Folds are close to the drain.. So after replacing liner, all was good for about two years and then it started again and now I have cuts in three or four places on those folds.. what do you say? By the way I fired the maintenance company, not because the owner was not good, but the workers he would have on his routs sucked! and I could not deal with them any longer, but that's another story... so any advices?