753 Green aux LED goes out when aux control switch is used

[mhawkins]

The green LED also goes out when the Aux button is pushed the second time. Last weekend I was able to use a 4-N-1 bucket until the bucket would not close. When attempting to close with the aux Control switch (pushed to the right) it would automatically open again after releasing the control switch. Then the green LED went out losing the aux function. Now, occasionally (but not always), after turning off the Bobcat and letting it sit a few minutes, the green LED will come on, but when I push the Aux button a second time or attempt to operate the aux control switch the LED goes out. Not sure if this is electrical or hydraulics... Unfortunately I do not have the tools (hydraulic tester). Any suggestions on to debug this issue?