Is it possible to re-flow the solder on the circuit board in the oil tank or is it sealed in epoxy? My '91 120hp sounds a constant alarm when the key is turned on, and I think I've narrowed the problem to the oil tank electronics, but I can't find any internet postings about repairing the circuit board, or even pics of it. I've re-soldered the connections numerous times on the instrument panel and relays on my old Volvos, but didn't know if cracked solder joints were any of the problem on the VRO.