anyone know what parts these are to find a replacement?
Hello user 51, welcome to the Forum.
I think the 4947 is Vishay Siliconix part # SI4947ADY-T1-GE3 which is obsolete. A possible substitute you can look at is ZXMP3A17DN8TA.
The 4936 I think is SI4936ADY-T1-E3 which we do have in stock.