Van is out of the garage, gave the Chamberlain a whack and it came back to life 
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I was able to read the exact part number and my board is 108$ from Chamberlain, but you have to be a "partner" to order from them. Found another source at 125$ CDN with free shipping, beats the 185$ from amazon.
Will do a quick check of connections after work before buying anything.
Undid all the connections, re-did them ... and it works fine now 
Whapping the side of it and then resetting the connections are usually the first steps in professional troubleshooting.
It's on the fritz again. Three or four whaps with a floor mop brings it back to life, and when it works most of the times it goes into safety mode and requires one to hold the button for the door to close completely. So my options were:
1) buy a macro lens for my iPhone, inspect the welds, find the crack and repair - about $40 and an afternoon of my time
2) order a new circuit board - 125$ at a Canadian online retailer
3) buy a complete new kit - $279 - $900
Given the age of the overall components, we chose option 3. After looking at various promotions, I found out that different CTC stores had different prices on identical products, given that one or the other may "clear" certain products. So I found this kit on clearance for $389 at my local CTC, 1 box left, new and intact so not a return:
https://www.homedepot.ca/product/chamberlain-secure-view-ultra-bright-smart-garage-opener/1001588567
msrp is in the $600's. That generation is not current anymore on Chamberlain's own website, but as the ex-top shelf model, it comes with lifetime warranty on motor and belt, plus some extras like a battery backup, garage camera and others. The camera I won't probably use as it requires a monthly app fee - we'll see - but all the myQ content is there, with phone alerts and door activation. Spring project, I'll wait for better weather to arrive. Keeping the floor mop close meanwhile.
