130.01 Accident on Leased Premises--Latent Defect If a landlord either knows about an existing defect on the premises which is not readily apparent, or knows of facts and circumstances which would indicate that there is such a defect, then he must tell his tenant about it [before the tenant moves in] [at the time of the letting]. However, a landlord need not warn his tenant about a defect which the tenant could have discovered by a reasonable inspection.