Thanks to the many nice folks on this site that took the time to help me out when i had to fix these friggin TINY planes, i managed to fix 3 of my planes that had "issues"......
PZ T-28...replace gearbox/motor assy
PZ Sukhoi 26xp....replace gearbox/ motor assy
E-Flite UMX Yak 54 replace receiver, program AS3X
Becuse of what ive learned from all the help i got here, all 3 planes fly like BRAND NEW!
THANK YOU VERY MUCH, Watt Flyer Folks!