There's a chance the set will work find after changing those parts. That's one of those situations where you just have to take a chance. If lightning or a power surge hit the set, it could have stopped with these parts or it could have gone deeper. The only way to know would be to replace the known defective parts.
www.tritronicsinc.com may have that regulator. Also, use caution when buying these types of parts. Many discount parts houses sell inferior generics or rejects at reduced prices. I've found out the hard way that such parts will often bite you in the butt. I've had them short either instantly or after a few minutes of operation and I've had them to simply not do anything. It's best to stick with first rate parts in this situation.