Like you, we have a 2007 PC-2350 with the original Tripp-Lite inverter/converter. We have owned our PC since new, so we have dealt with the Tripp-Lite for 16 years. I have NOT had your experience, so I cannot say what and why that happened to you. It sounds like everything happens to be working fine now, so I would not worry about the anomoly unless it becomes a chronic problem.
I have read negative comments on the Tripp-Lite inverter/converter, but my personal experience with ours has been fine. It does take some understanding and discipline for best battery care. I assume that is where the "negatives" reside.
I DO NOT STORE the motorhome plugged into 110V and have the TL maintain the batteries. I did the first year in storage which did not go well for me. I instead, disconnect all batteries from chassis and house, then using an external smart step charger, I immediately charge the batteries to full, then repeat every 3 to 4 months for maintenance.
If you drive from one RV park to another, from one 110V outlet to another with only one day in between without shore power, the Tripp-Lite works fine as it was originally set up. But if you commonly camp without shore power with your rig parked for a number of days at a time, consider disconnecting the headphone jack style connection to the remote panel below the fridge. That saves significant battery reserves.
http://forum.phoenixusarv.com/index.php/topic,73.0.htmlSince we almost exclusively dry camp without shore power, another practice I follow, is on the inverter itself, I turn it off when I don't have 110V shore power, or need inverted 110V power. I could disable it at the control panel under the fridge, but turning it off on the inverter itself saves more energy.
Another big battery savings was converting all lighting to LED.
http://forum.phoenixusarv.com/index.php/topic,2186.0.htmlAnother big battery improvement was converting from two 12V wet acid batteries, to two 6V AGM batteries. They were twice the price, but last 4X longer....and counting. The TL handles the 6V AGM batteries just fine.
http://forum.phoenixusarv.com/index.php/topic,2092.0.htmlWhen parked at a campsite for 3 or more days, I run the generator daily for about 1.5 hours using my smart step charger. I could use the TL but the step charger has a very nice display of my battery-charging progress.
I apologize for over-replying. I know that greatly irritates some people. I am not a self proclaimed "Mr Know It All" kind of guy.