Thanks a lot for the great description. I succeeded in repairing my hairdryer. The fan stopped spinning at the highest speed due to hairs caught in it. I removed them. Btw. I used tools for reparing a mobile phone which were very useful. I will add some pictures where I put crosses on the casing just to get an idea where the snap-fit caps are located. It helps to concentrate on these areas. I also succeeded in not breaking the snap-fit cap : )