SPOILER

Bertram rings PJ and asks to meet him. I would suspect this is in the church. and Bertram gives him information which then leads to identifying RJ.  The RJ voice has been dubbed over in the actual preview and comes later.

Watch this.
Not the first part. (that's a 30s preview) Watch it then........

it is a 2nd part press play again  once it has stopped. it last 1m 23 seconds.. kinda tells you what is going on

 I actually thought I had stumbled into the whole episode for a second.

http://www.spoilertv.com/2013/11/the-mentalist-episode-608-red-john_18.html