Solid state relay is p/n: RM1A23A50See info below about replacing the relay.
When replacing the relay, please cover metal portion of the new relay with thermal paste before installing. Here are some product names and locations where thermal paste can be purchased:
Radio Shack - Arctic Silver® Silver 5 Thermal Compound - Model: A2351
Walmart - Arctic Silver 5 High-Density Polysynthetic Silver Thermal Compound
Best Buy - Dynex™ - Thermal Compound - MODEL: DX-STC1001
HOME DEPOT - Super Lube 3 oz. Tube Heat Sink Compound - Model # 98003
Office Depot - StarTech.com 1.5g Metal Oxide Thermal CPU Paste Compound Tube for Heatsink - Item # 122130