Where can I download Apple Hardware Diagnostics for MacBookPro2,1?

My MacBook Pro 17-inch Core 2 Duo (MacBookPro2,1)'s DVD drive appears to be faulty - It treats working DVD's as 'blank'.
I want to run Apple Hardware Diagnostics (AHD) on the machine but (a) I can't find the original DVD for the machine (b) in any event it won't work as the drive is faulty!
I know I can download older versions of AHD at http://www.info.apple.com/support/aht.html but where can I find one for my Mac?
I want to download it and 'restore' it to a hard disc partition so I can boot it from there.
Any ideas anyone?

Every Mac model has its own components different than any other, and the Apple Hardware Test is unique to each model. A handful of models share one AHT. A pile of them are available for download but are obscured behind a non-obvious naming convention. A partial list is here and here. Unfortunately Apple simply doesn't make it easy to figure out how to restore this.
What I've learned is that pretty much all intel Macs before 10.7 did have AHT preloaded on the drive, found in hidden folder /System/Library/CoreServices/.dianostics. If you reformat the drive and reinstall, this is not reinstalled. And if you encrypt the drive with File Vault 2 it would be unavailable in any case. With 10.7 and newer hardware, the AHT is stuffed into an AHTxx.dmg file and found on the Recovery HD volume, also in a hidden directory. So it can still be used when FV2 encryption is enabled.
Since install disks are gone, I don't actually know how current Mac owners are supposed to get this restored, however also since that time, Apple has moved to firmware that can load the proper version of AHT via option-D on boot with a wired or wireless internet connection. It doesn't permanently download this to disk, the firmware downloads and runs it, and upon reboot it's gone again.
So the gist is, once you've lost the installed version of AHT, you either need the AHT disk that came with your computer or buy one from Apple or go to an Apple store and they'll run it for you. Or you have a newer Mac with firmware that can talk to Apple directly (pretty much anything 2010 and newer) over the internet.

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