shift solenoid electrical on 1994 Toyota Camry

2 codes come up on the reader Po753 and PO773
I can shift the trans. manually and sometimes there are no automatic shifting problems. Once the problem clears it may reappear after driving ten miles.The fluid level appears high although I have not added anything to it.

Asked by for the 1994 Toyota Camry
P0753 is a shift solenoid #1 failure (violet colored wire at solenoid, inside trans pan I think), P0773 is also a solenoid failure (blue/yellow wire at that solenoid), could be wiring, solenoid, transmission or computer failure need to follow test procedures to determine problem. There is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subscription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try
and get an online repair manual subscription. Or another company called Alldata will have the test procedures.
Thank You very much for the info. I'm going to follow the link and sign up for a week to try it out and hopefully I can fix the problem by myself.
Appreciate your help
Thank you for the info, I though it was because it was the summer heat at first, but it would do it in the cold also.But I can turn the car off go in a store and come back out start it up and drive 65 miles and it not do it again.