He is claiming a leak and needing repairs.

I calculate out of pocket costs with downpayment and neccesary repairs to be $75,0000. 

Can anyone recommend a septic repair/replacement company that services Vernon NJ?

Generally a turn over should require paint and a few minor repairs.

Cons: my grandfather hack jobbed most repairs. leaking roof, stoop and porch need redone, lower unit kitchen needs complete remodel, 4-5 coats of paint on all walls, reoccurring mold in 1 bedroom and same bedroom needs insulation, upstairs unit you can hear anything and everything, all doors are original that came with the home, also have 4-5 coats of paint on them. small cockroach pest problem (not severe YET), Bathroom needs remodel and sewage lines need repair.

Paid cash for the repairs, thought it would take 15k actual 20k3. technically subleased the property to another renter (1000/mo)4.

Documentation is required.Mobile homes are not eligible for the Welcome Home Program.Modular homes are eligible for the Welcome Home Program.If more than $500 is to be escrowed for buyer repairs, the property is ineligible for Welcome Home funds without advance written approval of the FHLB prior to closing.

I dont have problems with drafts in the house or have any inefficient heating or cooling bills.I got a quote to repair all the siding and repaint everything for $7500.Does this increase the value of my house when I go to sell it?

It doesn't seem that much more complicated to build and with that you have a nice new building with minimum maintenance and repairs for the first 5-10 years. 

With all expenses such as PITI, vacancies, Cap Ex, repairs, and MISC will be around $3400.