YS-D1 flash tube/electronics damage - repair/recovery?

Have had a set of YS-D1's since forever, one of them seems busted and wondering what I can do.

A year ago this particular strobe would work sporadically (fine testing pre dive but sporadic at depth during the dive) so I thought it was a faulty optical cable, but I replaced cables and it worked fine for a bit but after a few more dives recently it now only goes into red/green alternate blinking mode with full batteries. Also upon closer inspection, though the battery compartment seems fine with no flooding issues at all, I noticed some water lines on the side around the front of the flash tube, even though there are no noticeable cracks, just wear and tear.

Any suggestions as to how to possibly salvage this strobe? Most recovery techniques I'm familiar with are for battery compartment related floods but in this case I am wondering if there is anything I can do.

I do not dive or shoot as much as before so not rushing out to upgrade strobes yet - even brought out old inon Z220s and tested them but loved the D1's for a long time so wondering what options there are.

With those sorts of problems I would expect the strobe is probably toast unfortunately. The problem you describe sounds like an issue that others have reported in this forum and I don't recall anyone getting resolution.

Depending on where you are located you might be able to find an independent repair shop to have a look at them, unless you happen to be an electronics wiz, self-repair is probably not an option.   Sending them back to S&S often means you are without them for a long time and they have been reported to just say it's flooded and not repairable quite often.  Probably cheaper to keep an eye out for a second hand strobe to replace it.

I think Pacific Housing Repair is great. I've been shooting YS-D1s since 2013. I've had PHR do 3 repairs over the years (Including the one he's currently working on - flash tube). I keep thinking that I'm going to upgrade to newer strobes, but Devon is still able to fix them for a pretty reasonable price (Far less than I could buy a used one for). He pressure tests the strobes before returning them, and he's an authorized S&S repair shop so he checks them against factory specs before returning them. He's quite knowledgeable. He usually asks a few question and asks me to maybe do a simple test, and he's been very good at immediately knowing what the problem is and if he thinks it will be economically feasible to fix it.

But expect it to take 2-3 months. I have and travel with 3 strobes so if one needs repair, I still have 2.

https://www.pacifichousingrepair.com/

P.S. If you decide to upgrade, I might be interested in buying yours.