1955 Ca Eikler like home with original radiant floor heat- rehab costs?

[Michelle Hilton]

Hi All,
My first post and a newbie but here goes.
Quick summary of home: Bay Area home 3bd/2bth Eikler style home with radiant floor heat built in 1955. Home has not been remodeled since it was built with the exception of one bathroom. Does anyone know if the radiant heating systems have issues? If so, what might be the costs of replacement? The system is built into the concrete slab but unsure if it leaks. Trying to get a ball park figure if it needs to be replaced.
Thanks for any insight you all might have in regards this issue.
Michelle