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Seamonkeys

I have a 2004 Rinker 342 with original RL70C and 250 box. My temp reads 140F all the time and I keep getting a intermittent "sonar unavailable" alarm. Everything else seems to work, depth and radar etc. I have unplugged all cables to the box and have factory reset the RL70C with no change. Is their a solution to this, short of replacing everything? I have read where some have had Raymarine upgrade the software of the RL70C and then use a DS300. If this is an option would I have to replace the transducer and if so, what transducer would drop into the existing thru hull or does the whole unit have to be replace? The boat is used primarily for pleasure but like everyone else, I would like everything working they way its intended. Thanks