Velux skylight electrochromic glass will not tint

I have two skylights (Velux VSE), in-addition to opening and closing, when the remote control is changed to 'Mode 2' the glass tints dark (by applying a small electrical charge). However one of units stopped tinting. After not working yesterday, the window did darken today for a few minutes before returning to normal (the expected behavior is to stay dark for ~8 hrs before returning to normal).

I'm pretty sure the problem is the control board is not sending current when activated. The open/close operation works fine and the fact that it did work temporarily today suggests the power supply / transformer is not totally shot (right?).

Also interesting note: on the working unit there is a small light on the 2nd PCB (the one connected to the transformer) that stays on when the window is darkened, but on the broken unit the light only comes on when the control is clicked and turns off with the status LED light after a few seconds.

Anyone know how to troubleshoot / fix the power issue or find a replacement board? I contacted Velux support online yesterday but still waiting to hear back (and wouldn't mind swapping the pieces myself to save the time and money of sending a tech out).

 

Contacted Velux?

 

Yeah, waiting to hear back from them.