Water or Steam Boiler Repair

At arrival found external transformers for zone valves and relay, three in total have power. Relay appears to be closing for call for heat. Inside boiler I found aqua stat relay had no 24 volts. Try to track down possible shorts in Wiring inside boiler boiler and external vent damper. Explained findings to customer and explained their may be another component inside boiler that caused part to fail. Replaced aqua stat per customer request. Found water damage on old aqua stat. Cycled each zone and all zones together, all zones are operational at departure. Checked rollout switches for shorts, none found. Checked other wires for shorts at boiler, did not find shorted wires. Boiler is operational at departure, shuts off at 190 degrees at 18 psi.