I am using an Ilfolab 2150 for RC prints in the studio I work for and need help from any other users of this machine. After a few hours of use I am getting a noise from under the machine that I can only describe as a coffee percolator. Looking at the schematics it would seem that the only part under there would be the pump, but I wanted to see if anyone else had suggestions or experience that could help me before I order a new pump.

I appreciate any help.