Does any of that mean this loan has some serous defect?  

Sure there are defects such as the loan is non performing currently or there are other issues to be addressed, but remedying those are what adds value to the loan and makes it salable or a cash flow stream to tuck in your portfolio.

For any wholesalers out there, how are you reducing the number of deals that fall apart at the title company due to liens or defects?  

Hopefully I can get that written into the property inspection report as a Defect for the Seller to fix.

Among other considerations, if you want absolutely want or need all of the parcels, one contract is probably the best option (or multiple contracts with language that requires all to close or allows none to close) because a deal killer defect in one will allow you to bail on all. 

A crooked seller could abuse the process, too, by not disclosing defects that he knows will be uncovered by the buyer, knowing full well the buyer will probably cancel the contract once the inspection items are discovered, yet the seller gets to keep the option money.

They also have a limited lifespan of about 15 years, and they stopped making them in 1995 due to massive lawsuits against obvious defects and limited lifespan vs. copper and others.

Tenants are extremely hard on appliances, it is not uncommon.Landlord Responsibilities: Landlord will at all times during the tenancy keep the premises fit for human habitation, and shall in particular:a.Cultivate, care for and mow surrounding grass, lawn, flowers, and shrubberyb.Maintain the premises to substantially comply with any applicable code, statue, ordinance, or regulation governing the premisec.Maintain the roof, floors, walls, foundations, and all other structural components in reasonable good repair as to be usable and capable of resisting normal loadsd.Keep any shared or common areas reasonable clean, sanitary, and safe from defects increasing the hazards of fire or accidente.Provide a reasonable program for the control of infestation by insects, rodents, and other pests at move in f.Except where the condition is attributable to normal wear and tear, make repairs and arrangements necessary to put and keep the premises in as good condition as at move ing.Provide reasonably adequate locks and provide keys to the tenanth.Maintain all electrical, plumbing (main lines), heating, and other facilities and appliances supplied by Landlord in reasonably good working orderi.Maintain the unit in reasonably weather tight conditionj.Provide facilities adequate to supply heat and water and hot water as reasonably required by the tenant

Each state will have it's own rules so you need to check them out.In Florida for instance, If there are defects in the property that need to be addressed because they affect the habitability of the property, then you send a letter by certified mail and keep the receipts.

I could be wrong but unless there is a material defect in the home, you do not need to disclose this information.