Never, take a series progressive system apart! The spools inside the metering elements are all electronically matched and if you mismatch spools and bodies the system can lock up or even have so much clearance, they bypass inside. Also if any of the spools get the slightest score on them, they can also jam and cause hydraulic lockup that will not show up with the pin indicators or auto-relief's.
If he has a soap build up, it means he is probably running a cheap grease and it is separating under pressure, or he ran a different grease through and there was a compatibility issue. If he wants to take the time to do a PM on the system, I would recommend removing all the dividers and bench flow them with an oil-solvent mixture. This should clean out the valves enough to allow them to operate.
As for spares, your customer may have to realize that the system is 50 years old, and it's time to update to something from this century! Secondary dividers configures to service 148 points would probably run in the $5000 - $5800.
We can provide a quotation for a drop in system that has many advantages over the Trabon line.
Dean.
deanm@autolube.ca
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