St Lucia hot tub faulty (Chiswick Ground W4)

St Lucia hot tub has a slow puncture that I can’t find in the tub itself but someone should be able to fix it . I use an inflatable air mattress pump to pump it up every day (not included). Everything else works fine. The cover needs a clean. I will give it a wipe over but it obviously is outside . Comes with pod and cover Pickup from Chiswick asap. No holding.