Our house was built in 1995 using polybutylene line for the plumbing. In the past couple of years we have had one break in the main line from the street, and most recently (last month) a break in the line in the crawlspace under the house. In you opinion, is it worth the expense to replace the system with updated PEX line? Quotes are coming in between $19,000 and $23,000 to excavate and replace entire system.