Hi, i have just bought my first ever alfa, a 156. Ive been doing some research (alot thanx to this forum) and realise the cambelt needs regular changing. The car ive bought has a fully stamped service book but i dont have all the old reciepts to check whats been done, im told by the dealer the cambelt has been changed once at 40,000 miles, however the car is now at 76k. Are there any tell tale signs i can look for, or should i just change it anyway?