I haven't heard anything about a letter. I thought the P clamps werent suppose to be on main power wires-starter wires and alternator wires. Either way Im not signing anything.
Some of the "thermal events" or fire (the word the entire world uses) causes they come up with are nuts. There was one a few weeks or months ago, that UPS said was from transmission oil boiling over and catching fire. How the hell does tranny fluid boil over out of the dipstick? Allisons have temp sensors and limp modes/fallback modes. Ive never seen that. Fu$king nerds!
As far as P clamps go. Every heavy truck maker uses them with no problems. But some how Super UPS decides they know better then the OEM Engineers. You know, because after working 30 years at UPS, you are now at the top of the world and know everything. Some of the ideas management comes up with blows my mind. After they retire from UPS, the CIA should hire them for counter terrorism.
10 out of 100,000 trucks catch on fire, and they can solve the problem with removing the P clamps. I made those numbers up, but you know what Im saying.