Start right of Zee Tree (see below), and follow the flake system for several pitches to join Zee at the bottom of the backwards "J" flake high on the face. Finish on the .7 lie-back as per Zee Tree.
Location
Look for the alcove that sits at the top of P1 before you leave your car. OR from the start of the 3rd/4th class pitch on Zee Tree traverse to the right and start up the obvious flake system
I solicited info on this line via the SuperTopo forums, and this was the best info I got:
Re: Route Info Sought for Unknown Route on Pywiack Dome Jul 19, 2008, 11:31pm PT Author:Greg Barnes
There's a bunch of old routes in that area, some of which may even have gone where Zee Tree goes but without bolts. The Nelson guide listed a few - Boche Dope Route, West Face, Happy Wanderer. And that doesn't include Bard's Coffin - here's the beta:
"From the end of the second pitch of THE DIKE tie both ropes together and climb up and right until you are out of rope. At this point the belayer should untie allowing you to finish the route. Hardware: plenty nuts."
Anyway, that anchor may well be from before when people bothered noting down routes in Tuolumne, back when climbing without reaching a summit was just practice climbing and not worth naming!
By Brian From: Wakefield, RI Jul 28, 2008 rating: 5.6 R
The name of this route is House Calls. Check Reid's guide book "Rock Climbing Tuolumne Meadows" 3rd edition. The route in his topo that is farthest to the right is House Calls. He Reid rates it a 5.6x although I think "R" is more appropriate. It starts at the manky anchor with a couple of blue slings on it, goes up to one old bolt, and follows the overlaps to the ledge where Z-Tree and The Dike Route finish up. The last pitch up the steep corner is actually the finish to The Dike Route which is also the usual finish to Z-Tree. It is rated 5.7. The descent for House Calls, according to Reid, is to walk down the slabs to the right (climber's right) of the route.