Diamond pool

I have a 2001 hotsprings GRANDEE I noticed the spa was not hot enough for the girls, tried to up the temp but the display had some weird on it and wouldn't opperate, so i kicked the breaker off to reset( left off for 10 min) when system came back on there was no display @ all and the main pumps would not work the circ pump came on but thats all. i tried to test voltage on stuff all seamed ok, talked to another person who said that there was a problem with the topside ribbon cable on these spas, i unplugged all the connection to make sure there was no corrosion in the way, but again all seams good. ANY ONE HAVE THIS PROBLEM

first off its a good idea to upgrade it will be more efficent, but there is alot of work doing it so be ready, i do this for a living and sometimes it takes 3-4 hours or more some times and i usally have everything i could ever need in the van so be ready. the other is basic hydrolics will only allow so much water though that 1.5 plumbing so i would stick to a 2/2.5 hp pump, cause if you go to big you will just have problems like jets coming out and possable more leaks in plumbing do to over pressering them, on top of that to replace all the plumbing with bigger better in a REAL BIG JOB. good luck