Heat Pumps and Electric Heating - Compressor cycling on and off quickly

I just had a service technician out for a summer tune up. My system had been working perfectly, but I figured I'd have it checked out just in case.

When he hooked his gauges up to my compressor (a 5-year old high-end Trane) his hoses were leaking freon all over the place. He changed hoses to ones that weren't leaking but it looked like he was having problems with the readings. I'd asked him what the readings were supposed to be, and he told me the one on the right (can you tell I have no idea what I am talking about) was fine, but the one on the left should be at 50, it was at about 30 (I'm guessing the fact that his hoses leaked so badly had something to do with that.) Anyway, after hooking up his tank of coolant for a while it looked to me that he was still low - the gauge at 40ish when he disconnected.

Since then, my compressor comes on for a minute or less and turns off several times before staying on. The house is still quite cool, but I can't help but think he screwed something up.

I need to be armed with info and know whether I should even have this guy come back or call someone else. Right now the house is cool, but I don't know that my system isn't working twice as hard to do it, plus the temps outside have dropped 20 degrees since Friday when he did the work.

There is no "Suppose-to-be" reading on the gauge.. It all depends on the charging chart that comes with the unit.

I'd would call the dealer and give the manager heads up on what was going on, and they maybe can send someone else out to check it over.