2005 Camry 2.4L timing chain tensioner, likely it was leaking and a short grumble of the chain at start-up. Had a 1999 Prism 1.8 (Corolla) that had a long chain grumble at start-up cured by a new tensioner, and this seems to have cured the Camry as well, though time will tell on the oil leak. Tensioner was a Bapmic, says Germany on the box, but
this site says probably now been owned by a China Auto Parts company, bought 2 off eBay for a frugal (cheap) price, Toyota Part #13540-28010. Gasket is #13552-0H010, $4.97 at the dealership. So far the Camry started and sounds good, but I would probably source the tensioner locally or Rock Auto if I were purchasing again, might have got lucky on this one, time will tell...
Wasn't much instruction on this but I found a video and can interpret what I did if the video disappears. The photo shows the torque strut - 3 bolts, and the mount - 3 bolts, ground wire, which I removed for easier access. Wire harness is mounted over the tensioner, 1 bolt and a clip below that, clip was tricky, small pick from the back and it released. I didn't disconnect any of the wire harness at the alternator/ac compressor, but removed a bracket at the front side that is attached to the mount, leaving them connected together. Wire harness can be pushed back far enough to remove/replace tensioner, which a ratcheting wrench worked for me, 2 nuts and check the orientation when removing. Couldn't get on the crank bolt but using the alternator pulley bolt was able to move motor back a little then forward until the tensioner hook released and I heard it click.
Intentionally long winded as there wasn't much out there on this task, and here's my photo where I think you should be able to see the torque strut, mount, wire harness 10mm bolt, and the corner of the new tensioner.
Here's the video, start at 2:30m for brevity, as the intro is mostly just disconnecting the battery;
And one final attached photo that I tried to get in closer, not sure how much is visible there;