Arrived on site and Cassandra let me into boiler room. Customer was having issues with boiler not eating in certain zones. Offer customer pricing for diagnostics customer accepted. Checked pressure on boiler and found boiler pressure was a zero psi confirmed with hose bib gauge. Begin trying to pressurize system as main water shut off to boiler feed water was turned off. Boiler relief valve tripped at 30 psi. Shut valve off and watching gauge and pressure begin to drop tried to fill system multiple times. Walked around building and found a large leak where someone had poured solder over a freeze break. Isolated this system from boiler. Boiler pump on this system appeared to be locked up as it had been running for two plus months with no water in it. Zone control module for system also appeared to have charring on circuit board. Many small leaks are present on isolation valves and boiler drains. System is functioning in zones without leaks but a lot of work is needed as the 300000