awk '
BEGIN           {FS=","
                 for (i=split("findline,an10,an31,an40", t); i; i--) FLD[t[i]]=i
                }

/findline=00/   {for(i=1; i<=NF;i++)    {T=$i; sub (/=.*$/, _, T)
                                         if (T in FLD )
                                         OUT[FLD[T]]=$i
                                        }
                 for (f=1; f<=4; f++) printf "%s ", OUT[f];
                 print ""
                }
'
findline=00 an10=23 an31=32 an40=45 
findline=00 an10=24 an31=35 an40=95