Casey Kasem's Wife -- I Got Screwed Outta $80,000 +

Next on American Top 40 ... Casey Kasem's wife is gunning for revenge in a brand new lawsuit, titled, "You did a crap job painting my ginormous mansion and now I want my money back."

Jean Kasem filed a lawsuit -- obtained by TMZ -- claiming she hired New Life Custom Painting to work on parts of her 12,000-square-foot Cali mansion in 2012. Jean says she dropped major cash on the gig and the company gave her a 5-year warranty on the work.

Problem is, Jean says the work SUCKED ... was left incomplete ... and what was painted is already peeling.

In her suit, Jean claims her lawyers have reached out to the company to fix the problem or return the cash ... but NLCP has gone MIA.

Now, Jean is demanding more than $80,000 in damages.

FYI -- The house happens to be for sale. So if you've got $30 mil and don't mind a few (alleged) paint chips ... today's your lucky day.