This is an obvious writeup. "Undersink plumbing installed in amateur / non-workmanlike manner. Among the deficiencies are corrugated/temporary type drain pipe, lack of proper trap, lack of accessible water shutoffs to undersink water supply and unsealed/open pipe to wall penetrations. Recommend review and repair as needed by licensed plumbing contractor" Then you can tell the client verbally (if you want) that if he doesn't get it fixed, he might get some odors from the corrugated pipe or have to plunge it from time to time, etc. etc.