From 2007 to 2012 Trimbach was presiding judge at the Higher Regional Court of Brandenburg where he presided over the 13th Civil Senate and the 4th Family Senate.
Von 2007 bis 2012 war Trimbach Vorsitzender Richter am Brandenburgischen Oberlandesgericht, wo er den 13. Zivilsenat und den 4. Familiensenat leitete.