Dav 27

owned my95 wrx scooby for 6 months now and its due for its 60 mile service with the garage it was bought from,to comply with the extended warranty i took out on car for the year,the problem is ive just started to notice a knocking on my engine wen pulling onto the drive or reversing or basically at low revs when i can hear it.sort of tryed to look into it and i think it could be piston slap but not 100% certain , with the car being an import affect my warranty and what would have to be done to cure it , and most important of all would the garage accept that there is a problem and repair it regardless of cost well upto a grand i think the warranty covers, or would they not accept it and say the problem was my fault or somthing ,
pretty worried , any help app.