I just got my Punto back from SC after 3 weeks of R&D, for fixing the unusual noise (Krr...Krrr..Krrr) from the rear whenever I go over a pot hole. Initially I was told that there is an issue with rear axle and it has to be replaced, luckily they also have the spare available and is replaced under warranty. Even after replacing the axle still that Krr... Krr noise was there. Now the technicians at Tejaswi diagnosed it as faulty shocks in the rear. Now Both the shocks were replaced under warranty and vehicle was ok for a day but the noise has re appeared again. I was totally disappointed with this and escalated it to all the bosses in Fiat. Last week fiat has sent their technician to check this issue and he diagnosed it as an issue with SPOT WELDING on the body near the rear left shock. Spot welding was done again and the issue is gone forever. Also I was informed by the technician that most of the old puntos have this issue. So whenever you hear this noise (more like a teeth biting noise) from the rear left first ask the technician at the service centre to check the SPOT Welding. I also have a print out of the power point they have used for trouble shooting and will upload that as soon as I get a chance.