Leaks get worse when engine is at operating temp and pressure builds. Rent a cooling system pressure tester and pressurize the system. Then you'll see the leak
Do you know how to voltage drop automotive electrical circuit's using a DMM - digital multi-meter ? Checking main power feed to fuse box etc.... loose connection , bad positive feed cable etc ..
Do you know what wiring diagrams are ? Electrical distribution diagrams ?
Electric Testing Techniques You Need to Know
Free wiring diagrams here http://www.bbbind.com/free_tsb.html
Enter vehicle info. year , make , model an engine size. Under system click on electrical distribution then under subsystem click on power distribution . Click the search button then the blue link's . test the circuit's . Plus knowing how the systems work would be good . When you turn the key to start it send a low voltage signal to the BCM - body control module . The BCM sends a message to the PCM/ECM - engine computer to energize the starter relay . A lot of complex electronic's an electrical systems involved .
Make sure you bleed from rear furtherist from master cylinder and make sure when your helper is in drivers seat to pump brake pedal 4x then hold, at that holding point you open bleed screw then close once brake pedal is on the ground. Repeat 5x then move to the opp side and do the same. Then to the front furtherist from master cylinder and do the same. Making sure the brake fluid is always topped up also. Also check all your conecters in the lines are not leaking
Having the vehicle checked for DTC'S - diagnostic trouble code's an doing diagnostic's for the code is the proper way to diagnose , not guessing . No you cant reset it or disengage it ,need factory or professional scanner .
The shifter button on the shifter is released when you start up your car and step on the brake pedal. If you are having an intermittent problem, you may be having a shifter release solenoid issue. the shift solenoid is part of the brake light switch system so the problem can also be in the brake switch. If you do not know how to check it out, I would bring it to a reputable repair shop and have them check it out for you.
The PCM also sends a class 2 message to the instrument panel cluster (IPC) in order to illuminate the Cruise indicator.
This is not a fuse problem . What code was pulled ? P0 what ?
The problem is in the switch or possibly the motor itself. You need a competent auto electrician to troubleshoot the system. There is no hose or capacitor involved, so the guys you are taking it too do not know what they are doing.