Hi,
Our Debian-style package builds logs for RPB, 96boards and linaro builds are now available on repo.linaro.org. Previously build logs were available in jenkins, but they expired in 30 days from build.
Now build logs are located in the same directory as the packages - for example qemu, you would find the logs for qemu builds in http://repo.linaro.org/ubuntu/linaro-overlay/pool/main/q/qemu/ directory.
The build logs are also broadcast via the packages mailing list: