Could be main seal which is quite a large job, but advise looking inside could be a split drain hose to the pump, to access the inside, insert a flat blade 4" from each side between the front panel and the lid to release the clips. The lid will now hinge backwards, remove the 2 top screws on the inside of the front panel, this will now lift to remove. check the black hose at the rear of the drum to the pump.
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Could be main seal which is quite a large job, but advise looking inside could be a split drain hose to the pump, to access the inside, insert a flat blade 4" from each side between the front panel and the lid to release the clips. The lid will now hinge backwards, remove the 2 top screws on the inside of the front panel, this will now lift to remove. check the black hose at the rear of the drum to the pump.