You get a call for a one time cut. The house is in an upscale neighborhood. You agree on a price and get a signature on the work order. Your crew arrives and does the job. They pay and you move on to the next job. A few days later you get a call with a complaint that her irrigation is not working. You go and inspect it and yes, there are broken heads. Yes, you can see the tire print from the z over a head. The head is hard-lined in and is "olderthandirt" (no pun intended ). It is a 50/50 call. The other heads were clearly not damaged by mowing. You offer to repair the one head but the customer (PITA X2) now wants her entire system fixed. Here's the kicker, when you arrive she is having a lunch party and there are about 75 guest there, two happen to be your high $$$ customers. How would you handle this situation. The total repair would run AT COST about $700 with labor.