blueprint for 1978 Chaparral Double Wide home

[freevegas]

I need to find a blueprint for a 1978 Chaparral double wide home. The plumbing has been worked on by many different people and it's a mess. I'm looking for prints to locate the original piping so it can be repaired correctly. Thank you for your assistance.

[rmurray]

There is NO repository of old engineering drawings available..There would have been a plumbing drawing with the original owners manual.. Of course 30 years is a long time to keep this stuff...There would have been different drawings for each of the scores of floor plans the manufacturer built..My only suggestion would be to hire a competent plumber and have them draw a new one and re-plumb in a logical manor.