Hi Kris,
The service manual is available for download for silver and gold members, well worth the membership fees with all the documentation available. As s gold member, you even get to join in the monthly prize draw, checkout the prizes on the main website (top right corner).
TR52 is listed as part no. 8320161 (BC261B / BC212B-L / BC251B)
TR53 is listed as part no. 8320126 (BC312)
Martin