Mean Well EPP-400-12 – please help to find out clamp components values

[SergiiB]

I have a power supply EPP-400-12 that has failed. The power supply consists of a main board and an additional board RPS-400B-R8 which from the reverse engineering looks like a standby power supply and some protection circuitry.
Visual inspection of the main board shows no damage, checking capacitors, full bridge rectifier etc. shows no signs of short circuit, burning or cracks.
The only place that has visual damage is the clamp circuit on the additional board and it looks like this:


It can be seen that the resistor on the right (R908) is totally missing, the trace that connects the capacitor and the first resistor (R907) is missing as well. Also, there is a piece of the surface missing between the ground contact and the missing R908 resistor.
My thought is that there was a spark or some connection between ground contact and the missing R908 resistor where voltage is high as it is clamp circuit.
There reverse engineered circuit is this:


I have highlighted the missing component and the missing traces.
One of two resistors survived and has value 104, capacitor is chipped and cannot be measured. So, my question is what would be the values of the capacitor and the second resistor of the clamp circuit?
Can I assume that the second resistor is 104 as well as they used two instead of one to divide the heat dissipation?
And what would be the value and voltage of the capacitor? The voltage that goes on the + contact is taken from the 220uF 400V capacitor of the full bridge rectifier.

Regards, Sergii

[asis]

Hi,

Check out the pdf.
Denominations are indicated.
Both resistors are 100k.
In addition to the TNY286, the phototransistor of the optocoupler may be damaged.
Most likely this is the impact of lightning.
https://datasheetspdf.com/pdf-file/1469865/PowerIntegrations/TNY286DG/1 

[SergiiB]

Thank you.

But this is completely different clamp circuit, the resistor is in series there.

Noted about the optocoupler, will replace it just in case as well.

Regards, Sergii