The Alfresco ALX2-42SZ is a three burner grill that has 2 stainless steel U blue flame burners and 1 sear zone infrared burner. There were two series grills, one noted by a serial number of 10 and lower and the other with a serial number of 11 and forward.
Below you will find links to the parts manual for both series. If you cannot locate your serial number you can narrow down your grill buy the ignition system and the briquette tray.
SN: 11-00000 Forward - This grill used an electronic ignition and had a locking bar on top of the ceramic briquettes.
SN: 10-99999 & Lower - This grill had 2 battery operated spark generators