[Amps] Harris RF-350K disassembly of relais; help?!

[pa3fun at amsat.org (Christiaan Roselaar)]

Hi,
Recently I bought a Harris RF-350K HF-transceiver + 500Watt PA (3CX800A7).
Some relais in the Transceiver (Matsushita NT1-DC12V) in the low-pass 
filter need to be cleaned.
These relais are packed into a transparant plastic housing.
It looks like this housing can be removed but does this require special 
care?
What is the proper way to do this? Brute force or is there a more 
elegant way?
Any help appreciated!
73's Chris PA3FUN