Repair cooktop

I have a 900mm cooktop. 2 of 5 valves seem stuck and cannot push down. Need to clean/replace these 2 valves

Repair my deep fryer
4 deep fryers probably need replacement

Sagi hot plates piezo not working
When turning on gas hot plates piezo not sparking

Quote - cooktop and rangehood not workin. Had a minor explosion. Need repairing.
Cook top had a minor explosion causing rangehood not to work also, has had it...