Thank you, Skogsgurra
I'm not confident of the values I found
TIC226D: 63 Ohm (possibly, but unlikely damaged triac)
TIC226M: 630 Ohm (never used) (ten times more resistive. Not a typo)
Illegible power triac: 32 Ohm
Could someone back them up ?
Adding to Skogsgurra's answer: the resistance must be measured between MT1 and gate, ignoring MT2