Replacing parts does not lower the products standards. It is the same unit even enhanced and improved with something new. It can be comparable to a turkey filled with stuffing for Thanksgiving. It is the same fowl animal with something better inside. The outer covering remains the same despite changes inside.
It is not difficult to buy washing machine parts; however, it may be a little more difficult to pull that machine down and find out exactly what part is broken. If you are a true handyman, then this may not be anything to worry about, but for those who are not used to anything mechanical then it could pose a problem. The best thing to do is to get that repairman in to do the job and tell you what is needed.