Do I need to replace my iMac's drive?

I have an iMac G5 (PowerMac12,1), which I bought about six years ago. I tried to use Disk Utility three times and got similar error reports each time. Here's the last report:
Verifying volume “Macintosh HD”
Performing live verification.
Checking Journaled HFS Plus volume.
Checking Extents Overflow file.
Checking Catalog file.
Checking multi-linked files.
Checking Catalog hierarchy.
Checking Extended Attributes file.
Checking volume bitmap.
Checking volume information.
Invalid volume file count
(It should be 697387 instead of 697388)
Invalid volume directory count
(It should be 154945 instead of 154944)
The volume Macintosh HD needs to be repaired.
Error: Filesystem verify or repair failed.
I called a local Apple store about this problem. The tech said I need a new drive. He said the drive is old and failing. Just checking here to see if there is another answer. Thanks.

It easily could be failing.
But first try this...
"Try Disk Utility
1. Insert the Mac OS X Install disc, then restart the computer while holding the C key.
2. When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu at top of the screen. (In Mac OS X 10.4 or later, you must select your language first.)
*Important: Do not click Continue in the first screen of the Installer. If you do, you must restart from the disc again to access Disk Utility.*
3. Click the First Aid tab.
4. Select your Mac OS X volume.
5. Click Repair Disk, (not Repair Permissions). Disk Utility checks and repairs the disk."
http://docs.info.apple.com/article.html?artnum=106214
Then try a Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)
If perchance you can't find your install Disc, at least try it from the Safe Boot part onward.
If that doesn't fix it, which I suspect it will, your best bet is DiskWarrior, you need the CD/DVD though...
http://www.alsoft.com/DiskWarrior/
BTW, you might enjoy these DiskWarrior review/recommendations...
http://discussions.apple.com/thread.jspa?messageID=9645801&#9645801
http://discussions.apple.com/thread.jspa?messageID=10541019#10541019
http://discussions.apple.com/thread.jspa?messageID=11918925&#11918925
http://discussions.apple.com/thread.jspa?messageID=12684129#12684129
http://discussions.apple.com/thread.jspa?messageID=12744794&#12744794
http://discussions.apple.com/thread.jspa?messageID=12912879#12912879

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