MY AMP went out on my 2009 LS-460 while still under Factory Warranty. It messes up your NAV and all audio. Gave me a loaner car and kept mine for about a week so they could get a new amp. It lasted about 3 weeks and went out again. They finally traced some wires and found a short. Those amp are $1,700 bucks. EXTENDED WARRANTY was bought.
Glad you fixed your "Clicking" noise. Luckily I had a Lexus Dealer nearby and they gave me a Lexus Loaner.
United Radio gets good feedback and reviews. Only 325 dollars to repair ML amps and it's usually just a one day turnaround.
If only it was still $325 to repair our ML amps, that was UA price 2-3 yrs ago. The new price is $700 with same day turnaround depending on workload, It would have been nice to pay $325 but $700 is better than what a refurb or new one cost. Yes the pink fuse under the passenger footwell will kill the chirp another way is just to remove the amp, it has to come out anyway so that's the route I took. More info on the ML amp is in the FAQ sticky.