Reconstructions

PS
*plḥ - to be red-hot (EDA I 222)
PS
*plḥ - to till, to plow, to do agricultural work; to work; to serve (especially a deity), to venerate (EDA I 236)
PS
*plk - to split, to separate (EDA I 255)
PS
*plḳ - to split, to cleave (EDA I 258)
PS
*pll - to cut off, to divide, to separate (EDA I 196)
PS
*plš - to pierce (EDA I 299)
May be the same root as pls ‘to destroy’
PS
*pVlw/y- - yearling foal, small of domestic animals (SED II No. 174)
Probably related to the PS verbal root *plw/y ‘to separate, to wean’ for which v. CDG 161.
PS
*pVl(y)- - kind of insect, louse (SED No. 175)
Clearly related is the verbal root *ply ‘to delouse’ widely attested throughout Semitic. Cf. Tna. ˁafäl ‘insects or fleas which live in grass’ (TED 1949). One wonders whether it could be directly compared to Akk. uplu (< *ˁupl-)?
PS
*pan(ay)- - face (SED I No. 215)
PS
*p/ban/md(at)- - back, podex (SED I No. 216)

Phonetically a very difficult case; diverse phonetic processes are likely due to different patterns of compatibility of root consonants in various languages.