This BVP can be solved in a straightforward way, but you need Maple 14 or newer.
Side remark: you don't even need to load the PDEtools package for that. And simply writing its name won't load it anyways, the proper syntax is
I'm uploading my worksheet, saved in Maple 14, and with all output so that you can see (but not reproduce) it in Maple 12.
As always, the formatting is much nicer in the actual Maple session than its display in MaplePrimes.
Of course, for getting rid of the integration constant _C1 (and for plotting), you will need one more BC or IC.
If you're working in the field of BVPs for PDEs, we strongly recommend upgrading to the latest version. Lots of new functionality have been addedd in recent years by Edgardo S. Cheb-Terrab, please look up his contributions in this forum.