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Do you need to purchase the manuals, or are they available for a free download?
Is there a tool kit that works for most/all brands?
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Some manufacturers make their service manuals available to the public, others you just have to do some judicious googling. Most manufacturers will not provide their service manuals to the public, and will only provide them to factory certified technicians. Most manufacturers won't allow you to become a factory certified technician unless you're affiliated with a dive shop. Those service manuals are typically found online from third party sources. You're not gonna shoot an e-mail to Apeks and have some cheery bloke send a pdf back your way.
Sourcing parts is often similar. Many manufacturers will not provide parts on the open market. Dealers selling service kits can have their dealerships revoked. Not all manufacturers are like this, and there are a few who will allow anyone to purchase service kits.
Most regulators use the same basic set of tools, hex keys, picks, wrenches, etc. Some regulators require specialized tools to aid in assembly or disassembly. Some regulators don't require special tools, but they make it far easier.
The majority of all of this information will change depending on which regulators you own. I have regulators I cannot service myself because parts and information are unavailable. I have others that allow me to source parts and service guides directly from the manufacturer. It all depends.....