Hi, my washer dryer started not draining just recently. I cleared the drain filter thingummy and it then drained on the next wash. Then it stopped again so i checked the filter and it was ok. Checked the drain pipe and it appears to be clear. I assume its the drain pump then but is there a way to check before i buy a new one (dont want to waste the money)in case its something else? And are these pumps expensive? Thanks in advance