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I've attached (I hope) a photo of the control valve. I was able to find an online parts manual for the LA402, and based on my serial number (>50001) & matching the diagrams, I have the "4 position valve type". The lower red cap ring around the port and its trailing red cap become wet with HF...

I'm new to this forum & would appreciate advice from you mechanically inclined folks. My 2003 B2910's LA402 has developed a leak at the control valve - seemingly coming from the port that controls the dump function. In very cold weather (last month here in NH) the dump function had been very...