If your toilet isn't flushing properly, there is likely a clog in the system. Most minor clogs are easily resolved with a plunger. Please try this before making a maintenance request.
Is your sink or shower draining slowly or not at all? There may be a clog. These often occur as debris collects in the pipes.
You can try to clean a drain using a number of different tools. Most hardware stores sell drain cleaners you can use to try to pull the clog out. Liquid plumbing products are also useful, but please follow instructions carefully and do not overuse these or you could damage the pipes.